Make controller async

lib/tfw/networking/async_solvable_connector.py

@@ -0,0 +1,14 @@
+from tfw.networking.serialization import deserialize_all
+from tfw.networking.solvable_connector import SolvableConnector
+
+
+class AsyncSolvableConnector(SolvableConnector):
+    def __init__(self, async_zmq_context=None):
+        if async_zmq_context is None:
+            from zmq.eventloop.future import Context
+            async_zmq_context = Context.instance()
+        super(AsyncSolvableConnector, self).__init__(async_zmq_context)
+
+    async def recv(self):
+        response = await self._zmq_req_socket.recv_multipart()
+        return deserialize_all(*response)