Ethereum 2.0 Network Specification Upgrade (#510)

Updates lighthouse to the latest networking spec

-  Sync re-write (#496)
-  Updates to the latest eth2 networking spec (#495)
-  Libp2p updates and improvements

beacon_node/client/src/lib.rs

@@ -93,16 +93,9 @@ where
         }
         do_state_catchup(&beacon_chain, &log);
 
-        // Start the network service, libp2p and syncing threads
-        // TODO: Add beacon_chain reference to network parameters
         let network_config = &client_config.network;
-        let network_logger = log.new(o!("Service" => "Network"));
-        let (network, network_send) = NetworkService::new(
-            beacon_chain.clone(),
-            network_config,
-            executor,
-            network_logger,
-        )?;
+        let (network, network_send) =
+            NetworkService::new(beacon_chain.clone(), network_config, executor, log.clone())?;
 
         // spawn the RPC server
         let rpc_exit_signal = if client_config.rpc.enabled {

beacon_node/client/src/notifier.rs

@@ -34,7 +34,7 @@ pub fn run<T: BeaconChainTypes>(client: &Client<T>, executor: TaskExecutor, exit
         // Panics if libp2p is poisoned.
         let connected_peer_count = libp2p.lock().swarm.connected_peers();
 
-        debug!(log, "libp2p"; "peer_count" => connected_peer_count);
+        debug!(log, "Libp2p connected peer status"; "peer_count" => connected_peer_count);
 
         if connected_peer_count <= WARN_PEER_COUNT {
             warn!(log, "Low libp2p peer count"; "peer_count" => connected_peer_count);