Beta backports (#4067)

* Improving logs for transaction propagation

Conflicts:
	sync/src/chain.rs

* Propagate only on timer

Conflicts:
	sync/src/chain.rs

* Maintaining a list of transactions propagated from other peers

Conflicts:
	ethcore/src/client/client.rs
	ethcore/src/client/traits.rs
	js/src/dapps/localtx/Transaction/transaction.js
	js/src/dapps/localtx/Transaction/transaction.spec.js
	rpc/src/v1/tests/helpers/sync_provider.rs
	rpc/src/v1/types/sync.rs
	sync/src/api.rs
	sync/src/chain.rs
	sync/src/transactions_stats.rs

* fixing test

Conflicts:
	rpc/src/v1/tests/mocked/parity.rs

* Returning persistent node id

Conflicts:
	ethcore/light/src/net/context.rs
	ethcore/light/src/net/tests/mod.rs
	sync/src/api.rs

* Prevent broadcasting transactions to peer that send them.

Conflicts:
	js/src/dapps/localtx/Transaction/transaction.js
	rpc/src/v1/tests/helpers/sync_provider.rs
	rpc/src/v1/tests/mocked/parity.rs
	rpc/src/v1/types/sync.rs
	sync/src/api.rs
	sync/src/chain.rs
	sync/src/transactions_stats.rs

* Bumping versions

* Fixing broken classic.json