consensus: handle justification sync for blocks authored locally (#8698)

* consensus: add trait to control justification sync process

* network: implement JustificationSyncLink for NetworkService

* slots: handle justification sync in slot worker

* babe: fix slot worker instantiation

* aura: fix slot worker instantiation

* pow: handle justification sync in miner

* babe: fix tests

* aura: fix tests

* node: fix compilation

* node-template: fix compilation

* consensus: rename justification sync link parameter

* aura: fix test compilation

* consensus: slots: move JustificationSyncLink out of on_slot

substrate/client/network/src/protocol/sync.rs

@@ -632,6 +632,11 @@ impl<B: BlockT> ChainSync<B> {
 		})
 	}
 
+	/// Clear all pending justification requests.
+	pub fn clear_justification_requests(&mut self) {
+		self.extra_justifications.reset();
+	}
+
 	/// Request syncing for the given block from given set of peers.
 	// The implementation is similar to on_block_announce with unknown parent hash.
 	pub fn set_sync_fork_request(
@@ -1117,7 +1122,7 @@ impl<B: BlockT> ChainSync<B> {
 							number,
 							hash
 						);
-						self.extra_justifications.reset()
+						self.clear_justification_requests();
 					}
 
 					if aux.needs_justification {