Silence known deprecation warnings (#2651)

* Silence known deprecation warnings

1. Prefixes known instances of usages of client.backend and client.import_lock with `#[allow(deprecated)]` to silence the warnings. 2. Remove file-global `#![allow(deprecated)]` used in these cases. Both to prevent us overlooking externally caused deprecation messages.

* fixing missing ;

* fix missing test cases

* move deprecated markers to make CI happy

* move deprecated markers to make CI happy

* attempt to fix the test

* bumping impl_version of node runtime

* Minor cleanup

substrate/core/cli/src/informant.rs

@@ -83,6 +83,7 @@ where C: Components {
 				TransferRateFormat(bandwidth_upload),
 			);
 
+			#[allow(deprecated)]
 			let backend = (*client).backend();
 			let used_state_cache_size = match backend.used_state_cache_size(){
 				Some(size) => size,
@@ -132,6 +133,7 @@ where C: Components {
 		if let Some((ref last_num, ref last_hash)) = last {
 			if n.header.parent_hash() != last_hash {
 				let tree_route = ::client::blockchain::tree_route(
+					#[allow(deprecated)]
 					client.backend().blockchain(),
 					BlockId::Hash(last_hash.clone()),
 					BlockId::Hash(n.hash),