Fix grpc size limitation (#703)

Author: Hazhzeng

azure_functions_worker/dispatcher.py

@@ -85,10 +85,10 @@ def load_bindings(self):
 
     @classmethod
     async def connect(cls, host, port, worker_id, request_id,
-                      connect_timeout, max_msg_len=None):
+                      connect_timeout):
         loop = asyncio._get_running_loop()
         disp = cls(loop, host, port, worker_id, request_id,
-                   connect_timeout, max_msg_len)
+                   connect_timeout)
         disp._grpc_thread.start()
         await disp._grpc_connected_fut
         logger.info('Successfully opened gRPC channel to %s:%s', host, port)