buildman: remove old create_task for queue metrics

buildman/server.py

@@ -196,8 +196,5 @@ class BuilderServer(object):
     create_wsgi_server(self._controller_app, loop=loop, host=host, port=controller_port, ssl=ssl)
     yield From(loop.create_server(transport_factory, host, websocket_port, ssl=ssl))
 
-    # Initialize the coroutine reporting metrics
-    loop.create_task(self._metrics_updater())
-
     # Initialize the work queue checker.
     yield From(self._work_checker())