* Using child storage, (srml-support only), test failing .

* fix simple tests.

* Enumerable by requiring owned struct (previous form only allow
&'static).
Broken tests are from genesis init.

* implement for_child_keys_with_prefix

* indent

* clear_child_prefix fix.

* clear_child_prefix fix 2.

* fix for storage_impl, if/when allowing child and not child this could be
reverted.

* Fix lot of urlinked child genesis, still need to look upon actual
genesis srml module code.
Probably still a lot of broken code needing debugging.

* switch well_known_key to their associated module child trie.
Fix a genesis init (balance).
Complete some testing.
Comment some tests before using.

* fixing test runtime child keys

* latest commit fix broken genesis init

* fix system balances child name.

* Important fix: storage_root from test externalities need children (it is
already the case for ext).

* executive root with child calculation

* Avoid empty trie on test ext.

* Symetric removal of key for system.

* commenting changes related tests.

* Remove child module specifics.

* fix issues.

* fix some formatting

* fix bench and bump runtime

* Remove extend_storage_overlays, assimilate_storage do the same as is
proper considering srml macro.

* Fix warning for assimilate.

* Removing kill as they do not impact any test cases.

* Use tuple of storage map instead of two parameters. This changes the
behavior of decl_storage genesis build closure (breaking api).

* Do not use build storage before assimilate.

* fix error

* Update core/state-machine/src/backend.rs

* srml-contracts: Storage access micro-optimization.

* srml-contracts: Refactor runtime functions to reduce duplication.

* Bump node runtime impl version.

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: joe petrowski <[email protected]>

Co-Authored-By: Robert Habermeier <[email protected]>

Co-Authored-By: Gavin Wood <[email protected]>

# Conflicts:
#	node/cli/src/chain_spec.rs
#	node/runtime/src/lib.rs
#	srml/im-online/src/lib.rs

Co-Authored-By: Gavin Wood <[email protected]>

* clarify comment

* clarify comment

* clarify comment

* Make sure that `srml-collective` does not initialize `Members` twice

* Implement trait for `()`

* Fix test

* Fix whitespacing

* Replace configurable fields with default values

* Bump version

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <[email protected]>

* Fix more whitespacing

* Fix style

* Add transaction pool to babe import queue

* Add transaction pool to Babe check header

* Fix tests

* Add tx pool to Aura import_queue

* Fix tests, node-template

* Add comments regarding unused _transaction_pool

* Make tx pool optional in check_header

* Better state pinning

* Fixed pinning race

* Update core/state-db/src/noncanonical.rs

Co-Authored-By: Robert Habermeier <[email protected]>

# Conflicts:
#	node/cli/src/chain_spec.rs
#	node/runtime/src/lib.rs
#	srml/staking/src/lib.rs
#	srml/staking/src/mock.rs
#	srml/staking/src/tests.rs

`PeerSetHandle.set_priority_group` allows modifying a priority group by
group identifier. With this commit the function can be accessed through
`NetworkService`.

This is need in order for a validator to connect to as many other
validators as configured without reserving a specific connection slot
for them.