lint: fix deprecation warnings from threading package (#2823)

Set `daemon` attribute instead of using `setDaemon` method that
was deprecated in Python 3.10.

Signed-off-by: Karthikeyan Singaravelan <tir.karthi@gmail.com>

tests/integration/api_image_test.py

@@ -281,7 +281,7 @@ def do_GET(self):
 
         server = socketserver.TCPServer(('', 0), Handler)
         thread = threading.Thread(target=server.serve_forever)
-        thread.setDaemon(True)
+        thread.daemon = True
         thread.start()
 
         yield f'http://{socket.gethostname()}:{server.server_address[1]}'

tests/unit/api_test.py

@@ -378,7 +378,7 @@ def setUp(self):
         self.server_socket = self._setup_socket()
         self.stop_server = False
         server_thread = threading.Thread(target=self.run_server)
-        server_thread.setDaemon(True)
+        server_thread.daemon = True
         server_thread.start()
         self.response = None
         self.request_handler = None
@@ -488,7 +488,7 @@ def setup_class(cls):
         cls.server = socketserver.ThreadingTCPServer(
             ('', 0), cls.get_handler_class())
         cls.thread = threading.Thread(target=cls.server.serve_forever)
-        cls.thread.setDaemon(True)
+        cls.thread.daemon = True
         cls.thread.start()
         cls.address = 'http://{}:{}'.format(
             socket.gethostname(), cls.server.server_address[1])