misc: life_mngr: add script to do user VM shutdown

COM2 in user VM is used by acrnctl to do user VM
shutdown.
In this patch series, COM2 in user VM is used as uart
channel device for new lifecycle manager. So acrnctl
can't be used to do user VM shutdown.

This patch provides a script to user to do guest
shutdown in service VM. Lifecycle manager in service
VM will send user VM shutdown command to user VM directly.

TODO: When user VM shutdown is supported in libvirt, this
script will be removed.

Tracked-On: #6652

Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>
Reviewed-by: fei1.li@intel.com

misc/services/life_mngr/user_vm_shutdown.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 Intel Corporation.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+import socket
+import sys
+
+class SocketClient:
+    def __init__(self):
+        pass
+    def connect_to_server(self):
+        SOKET_ADDR = '/var/lib/life_mngr/monitor.sock'
+        SHUTDOWN_REQ = 'user_vm_shutdown:' + sys.argv[1]
+        BUF_LEN = 1024
+
+        print(SHUTDOWN_REQ)
+        # unix domain sockets
+        server_address = SOKET_ADDR
+        socket_family = socket.AF_UNIX
+        socket_type = socket.SOCK_STREAM
+
+        sock = socket.socket(socket_family, socket_type)
+        sock.connect(server_address)
+        sock.sendall(SHUTDOWN_REQ.encode())
+        data = sock.recv(BUF_LEN)
+        print(f"Waiting for ACK message...: {data.decode()}")
+        sock.close()
+
+if __name__ == "__main__":
+       socket_client_obj = SocketClient()
+       socket_client_obj.connect_to_server()