Ensure total tokens in system is kept up to date (#428)

* Squashed commit of the following:

commit 802b219d86a63f2a68a2f2fbc406229d192ce99f
Author: shamardy <[email protected]>
Date:   Tue Aug 14 19:13:52 2018 +0200

    Removed set_bad_validators function

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Merge: 671c53a6 354457d9
Author: shamardy <[email protected]>
Date:   Tue Aug 14 18:00:56 2018 +0200

    Merge branch 'master' into Issue#303

commit 671c53a68f0357171d1bbbcd46f1ed7dd68755af
Author: shamardy <[email protected]>
Date:   Tue Aug 14 08:16:55 2018 +0200

    Updated test

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Author: shamardy <[email protected]>
Date:   Tue Aug 14 08:14:07 2018 +0200

    Squashed commit of the following:

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    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 07:30:36 2018 +0200

        Update Tests

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    Date:   Tue Aug 14 06:45:34 2018 +0200

        fix

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    Date:   Tue Aug 14 06:36:50 2018 +0200

        fix

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    Date:   Tue Aug 14 05:53:35 2018 +0200

        fix

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    Author: shamardy <[email protected]>
    Date:   Tue Aug 14 00:34:10 2018 +0200

        Function to set bad validators

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 23:35:46 2018 +0200

        fix

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 23:00:08 2018 +0200

        Edit

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 22:25:56 2018 +0200

        Edit fix

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 21:39:57 2018 +0200

        fix

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 21:11:08 2018 +0200

        Edit for early exit slashing tests by adding bad validators manually

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    Author: shamardy <[email protected]>
    Date:   Mon Aug 13 15:06:57 2018 +0200

        Update header root to match storage root in wasm test

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    Author: shamardy <[email protected]>
    Date:   Sun Aug 12 15:27:57 2018 +0200

        Update header root to match storage root in test

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    Date:   Sun Aug 12 14:07:40 2018 +0200

        Update tests

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    Date:   Sun Aug 12 13:14:13 2018 +0200

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            Edited Tests

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        Date:   Sun Aug 12 12:08:47 2018 +0200

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            Date:   Sun Aug 12 03:53:40 2018 +0200

                Edited Test

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            Author: shamardy <[email protected]>
            Date:   Sun Aug 12 03:16:38 2018 +0200

                Check that block 4 is the final block in session

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            Date:   Sun Aug 12 02:31:12 2018 +0200

                LastLengthChange should change to block number when setting length

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            Date:   Sun Aug 12 00:17:22 2018 +0200

                Squashed commit of the following:

                commit 48fae25a49b0aa3294ab04651f0c2cb530994d9a
                Author: shamardy <[email protected]>
                Date:   Sat Aug 11 23:32:25 2018 +0200

                    Increase TotalStake by ReclaimRebate if NewAccountOutcome::GoodHint

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                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 01:45:48 2018 +0200

                    Updating set_free_balance_creating

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                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 00:52:40 2018 +0200

                    fix for TotalStake tracking in transfer and set_free_balance_creating fn

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                Author: shamardy <[email protected]>
                Date:   Fri Aug 10 00:03:17 2018 +0200

                    Fix if account created on an old account with more balance

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                Date:   Thu Aug 9 22:32:48 2018 +0200

                    fix

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                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 21:36:27 2018 +0200

                    fix totalstake update in set_free_balance_creating fn if account exists

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                Author: shamardy <[email protected]>
                Date:   Thu Aug 9 20:26:30 2018 +0200

                    TotalStake is updated in contract_transfer_max_depth function

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                Date:   Thu Aug 9 20:22:17 2018 +0200

                    Squashed commit of the following:

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                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 19:08:49 2018 +0200

                        fix for tests with set_free_balance calls

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                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 18:28:03 2018 +0200

                        Update TotalStake where set_free_balance is called

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                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 9 16:57:36 2018 +0200

                        Update TotalStake where set_reserved_balance is called

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                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 16:44:59 2018 +0200

                        fix

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                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 15:47:03 2018 +0200

                        Test for full_native_block_import_works to check storage root

                    commit 024249ca52ae7ef0f5d39e99c585617a3db1dc0c
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 14:38:07 2018 +0200

                        Use <FreeBalance<Test>>::insert in this fn to avoid TotalStake Overflow

                    commit d602839cd59dd8550c87ec2c0bf103c806daedab
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 13:59:47 2018 +0200

                        Removed <TotalStake<Test>>::put from tests

                    commit 38586043912b40c9004bb5232cb7ca3c01ec9144
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 13:56:15 2018 +0200

                        Replace Balance::insert in tests to set balance fn to update TotalStake

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                    Merge: 9b0b22bd 2230b61c
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 12:32:05 2018 +0200

                        Merge branch 'Issue#303' of https://github.com/shamardy/polkadot into Issue#303

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                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 12:31:45 2018 +0200

                        Edit

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                    Merge: 2fe9c528 18d4234b
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 11:12:19 2018 +0200

                        Merge branch 'master' into Issue#303

                    commit 2fe9c528bef62b0f43ef98c5166408d7d048f513
                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 11:09:08 2018 +0200

                        commented out some tests

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                    Author: shamardy <[email protected]>
                    Date:   Fri Aug 3 10:35:17 2018 +0200

                        fix

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                    Author: shamardy <[email protected]>
                    Date:   Thu Aug 2 16:52:16 2018 +0200

                        Update

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                    Date:   Thu Aug 2 16:05:40 2018 +0200

                        Edit

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                    Date:   Wed Aug 1 16:49:40 2018 +0200

                        Edit

                    commit 07c5dcec22e43d6ccb49b42356590fb370bbcfae
                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 15:44:40 2018 +0200

                        Instead of update_total_stake => 2 functions to increase and decrease

                    commit 7eb03b29e429a86d206244779d383af9437f208d
                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 14:24:36 2018 +0200

                        Removed update_total_stake from set_free_balance_creating

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                    Author: shamardy <[email protected]>
                    Date:   Tue Jul 31 14:22:48 2018 +0200

                        Squashed commit of the following:

                        commit 8f2e421a731f353394c611dc6e93ad48ba811a1a
                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 13:24:30 2018 +0200

                            added balances to trait Store

                        commit b64c3a99467895b042f6a30219caf87f8265fa90
                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 12:52:16 2018 +0200

                            update_total_stake iterates through balances

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                        Author: shamardy <[email protected]>
                        Date:   Tue Jul 31 11:06:25 2018 +0200

                            Removed update_total_stake from inside transfer function for now to test

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                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 21:26:09 2018 +0200

                            update_total_stake function fix

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                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 21:10:02 2018 +0200

                            fix

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                        Date:   Mon Jul 30 19:36:21 2018 +0200

                            fix

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                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 18:38:50 2018 +0200

                            update

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                        Author: shamardy <[email protected]>
                        Date:   Mon Jul 30 18:36:43 2018 +0200

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                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:31:49 2018 +0200

                                update

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                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:23:59 2018 +0200

                                Update

                            commit f828c69e055489b69739b0ea082afa1ceca23b9c
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 18:12:18 2018 +0200

                                Created function to update total stake

                            commit e398a587edb7e57378bd61c9f9940aadfb94e82a
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 15:02:07 2018 +0200

                                TotalStake tracks transfer fees + added test for account removal

                            commit 0cfb26ce508578ce386bac5e02856cb6f298c6ba
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:21:06 2018 +0200

                                TotalStake tracks accounts removal when free/reserved balance is too low

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                            Merge: 5740c8fc 6fa9c949
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:16:37 2018 +0200

                                Merge branch 'Issue#303' of https://github.com/shamardy/polkadot into Issue#303

                            commit 5740c8fc09cdac9ec2228a66626b1c1ecb5dbeaf
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:15:41 2018 +0200

                                Resolved merge conflict by incorporating both suggestions.

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                            Merge: 2b29fe85 9d7a3c1d
                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 14:12:11 2018 +0200

                                Merge branch 'master' into Issue#303

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                            Author: shamardy <[email protected]>
                            Date:   Mon Jul 30 13:48:48 2018 +0200

                                Squashed commit of the following:

                                commit 773cdb913f671f575cc2933b14f2e783f49ffd7e
                                Author: shamardy <[email protected]>
                                Date:   Mon Jul 30 13:13:21 2018 +0200

                                    Squashed commit of the following:

                                    commit 07dc1945c3b51438028494f7691343638d647a93
                                    Author: shamardy <[email protected]>
                                    Date:   Mon Jul 30 13:08:00 2018 +0200

                                        TotalStake tracks accounts removal when free/reserved balance is too low

                                    commit 1b04d3afab44c99751c389ac6cddd865c0f77015
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 21:29:35 2018 +0200

                                        Edited slashing reserved balance tests

                                    commit 52482d5ac5828e927afcd7f27010ef64c085353f
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 20:46:17 2018 +0200

                                        Edited some tests

                                    commit 7c98f96d2ea1952b241054581bc1430863e4aab4
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 20:11:54 2018 +0200

                                        TotalStake tracks slashing of reserved balance

                                    commit 1d9f942ede81281218c1b4f84201388cf0908a4e
                                    Author: shamardy <[email protected]>
                                    Date:   Thu Jul 26 18:43:36 2018 +0200

                                        Ensure total tokens in system is kept up to date

* Fix Test