moved sample zmq SUB client to test/

Former-commit-id: ab13e10271

test/client.py

@@ -0,0 +1,14 @@
+import signal
+import zmq
+
+signal.signal(signal.SIGINT, signal.SIG_DFL)
+
+context = zmq.Context()
+
+socket = context.socket(zmq.SUB)
+socket.connect('tcp://localhost:5678')
+socket.setsockopt(zmq.SUBSCRIBE, b'status')
+
+while True:
+    message = socket.recv_multipart()
+    print(f'Received: {message}')