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/node/consensus/src/service.rs

@@ -79,6 +79,7 @@ impl Service {
 		transaction_pool: Arc<TransactionPool<A>>,
 		thread_pool: ThreadPoolHandle,
 		key: ed25519::Pair,
+		block_delay: u64,
 	) -> Service
 		where
 			A: AuthoringApi + TPClient<Block = <A as AuthoringApi>::Block> + 'static,
@@ -105,6 +106,7 @@ impl Service {
 				network,
 				handle: thread_pool.clone(),
 				offline: Arc::new(RwLock::new(OfflineTracker::new())),
+				force_delay: block_delay,
 			};
 			let bft_service = Arc::new(BftService::new(client.clone(), key, factory));