tests/functional: Convert the vnc test

Nothing thrilling in here, it's just a straight forward conversion.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241218131439.255841-2-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/functional/meson.build

@@ -224,6 +224,7 @@ tests_x86_64_system_quick = [
   'pc_cpu_hotplug_props',
   'virtio_version',
   'x86_cpu_model_versions',
+  'vnc',
 ]
 
 tests_x86_64_system_thorough = [

tests/functional/test_vnc.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+#
 # Simple functional tests for VNC functionality
 #
 # Copyright (c) 2018 Red Hat, Inc.
@@ -11,7 +13,7 @@
 import socket
 from typing import List
 
-from avocado_qemu import QemuSystemTest
+from qemu_test import QemuSystemTest
 
 
 VNC_ADDR = '127.0.0.1'
@@ -51,10 +53,7 @@ def find_free_ports(count: int) -> List[int]:
 
 
 class Vnc(QemuSystemTest):
-    """
-    :avocado: tags=vnc,quick
-    :avocado: tags=machine:none
-    """
+
     def test_no_vnc(self):
         self.vm.add_args('-nodefaults', '-S')
         self.vm.launch()
@@ -113,3 +112,6 @@ class Vnc(QemuSystemTest):
         self.assertFalse(check_connect(a))
         self.assertTrue(check_connect(b))
         self.assertTrue(check_connect(c))
+
+if __name__ == '__main__':
+    QemuSystemTest.main()