Mark RequestHandlerFactory.finish_connections.locals.cleanup() coroutine

Author: asvetlov

aiohttp/web.py

@@ -1544,6 +1544,7 @@ def finish_connections(self, timeout=None):
         for handler in self._connections.keys():
             handler.closing()
 
+        @asyncio.coroutine
         def cleanup():
             sleep = 0.05
             while self._connections: