Rewrite the network TestNet (#3016)

* Add a memory-only option for the network

* Tests cleanup

* Make grandpa/aura/babe compile

* Aura and Babe tests now passing

* More work on tests rewrite

* Attempt to fix grandpa

* Make more grandpa tests pass

* More grandpa tests work

* Work on sync tests

* More work

* light_peer_imports_header_from_announce passes

* can_sync_small_non_best_forks passes

* syncing_node_not_major_syncing_when_disconnected passes

* blocks_are_not_announced_by_light_nodes passing

* All sync tests passing 🎉

* Some TestNet cleanup

* Work on grandpa tests

* More grandpa work

* GrandPa work

* Add check about block_import

* Remove the temporarily added Sync

* Fix network tests warnings

* voter_persists_its_votes passes

* Fix imports in network tests

* Fix service tests

* Call on_block_imported 🤷

* Add shortcut

* Finish using shortcut

substrate/core/service/test/src/lib.rs

@@ -35,7 +35,7 @@ use service::{
 	FactoryExtrinsic,
 };
 use network::{multiaddr, Multiaddr, ManageNetwork};
-use network::config::{NetworkConfiguration, NodeKeyConfig, Secret, NonReservedPeerMode};
+use network::config::{NetworkConfiguration, TransportConfig, NodeKeyConfig, Secret, NonReservedPeerMode};
 use sr_primitives::generic::BlockId;
 use consensus::{ImportBlock, BlockImport};
 
@@ -160,8 +160,10 @@ fn node_config<F: ServiceFactory> (
 		non_reserved_mode: NonReservedPeerMode::Accept,
 		client_version: "network/test/0.1".to_owned(),
 		node_name: "unknown".to_owned(),
-		enable_mdns: false,
-		wasm_external_transport: None,
+		transport: TransportConfig::Normal {
+			enable_mdns: false,
+			wasm_external_transport: None,
+		},
 	};
 
 	Configuration {