rebase and remove unneeded function

tests/common.rs

@@ -80,10 +80,3 @@ pub async fn join_room<EG: EntityGateway>(ship: &mut ShipServerState<EG>, id: Cl
         item: room_id,
     })).await.unwrap().for_each(drop);
 }
-
-pub async fn change_lobby<EG: EntityGateway>(ship: &mut ShipServerState<EG>, id: ClientId, lobby: u32) {
-    ship.handle(id, &RecvShipPacket::LobbySelect(LobbySelect{
-        menu: LOBBY_MENU_ID,
-        lobby: lobby,
-    })).await.unwrap().for_each(drop);
-}