message: [network] Removing a panic, just in case
  In `handle_inbound_substream` we panic if it is called with something else than a `PeerManagerNotification::NewInboundSubstream`.
  I'd rather we do nothing in release, and panic in debug.
  Closes:
  Approved by: bmwill
diff: @@ -411,7 +411,8 @@ async fn handle_inbound_substream<TSubstream>(
  );
  }
  }
  - notif => unreachable!(
  + notif => debug_assert!(
  + false,
  "Received unexpected event from PeerManager: {:?}, expected NewInboundSubstream",
  notif
  ),
  