Set ZMQ_LINGER

This will discard any pending messages immediately when the socket is
closed. The default is to wait forever for any pending messages which
can cause the the daemon to hang on shutdown.

See: http://api.zeromq.org/4-2:zmq-setsockopt

Author: jovial

networking_mlnx/eswitchd/eswitch_daemon.py

@@ -64,6 +64,7 @@ def _parse_physical_mapping(self):
     def _init_connections(self):
         context = zmq.Context()
         self.socket_os = context.socket(zmq.REP)
+        self.socket.setsockopt(zmq.LINGER, 0)
         os_transport = constants.SOCKET_OS_TRANSPORT
         os_port = constants.SOCKET_OS_PORT
         os_addr = constants.SOCKET_OS_ADDR