Integration tests (#805)

* Started substrate tests

* Sync test

* Test updates

* Improved tests

* Use on-chain block delay

* Parallel test execution

* Otimized tests

* Logging

* Fixed racing test

* Fixed compilation

* Fixed timestamp test

* Removed rlp dependency

* Minor fixes

* Fixed tests

* Removed best_block_id and resolved fdlimit issue

* Whitespace

* Use keyring

* Style

* Added API execution setting

* Removed stale import

substrate/core/client/src/blockchain.rs

@@ -89,6 +89,8 @@ pub struct Info<Block: BlockT> {
 	pub genesis_hash: Block::Hash,
 	/// The head of the finalized chain.
 	pub finalized_hash: Block::Hash,
+	/// Last finalized block number.
+	pub finalized_number: <<Block as BlockT>::Header as HeaderT>::Number,
 }
 
 /// Block status.