Give names to channels (#5626)

* Give names to channels

* Fix

* A couple more changes

* More minor tweaks

* Fix test

substrate/client/network-gossip/src/lib.rs

@@ -99,7 +99,7 @@ pub trait Network<B: BlockT> {
 
 impl<B: BlockT, H: ExHashT> Network<B> for Arc<NetworkService<B, H>> {
 	fn event_stream(&self) -> Pin<Box<dyn Stream<Item = Event> + Send>> {
-		Box::pin(NetworkService::event_stream(self))
+		Box::pin(NetworkService::event_stream(self, "network-gossip"))
 	}
 
 	fn report_peer(&self, peer_id: PeerId, reputation: ReputationChange) {