disable fork test on windows

src/python/grpcio_tests/tests/unit/_server_shutdown_scenarios.py

@@ -63,7 +63,7 @@ class GenericHandler(grpc.GenericRpcHandler):
             return None
 
 
-def run_server(port_queue,):
+def run_server(port_queue):
     server = grpc.server(
         futures.ThreadPoolExecutor(max_workers=10),
         options=(('grpc.so_reuseport', 0),))

src/python/grpcio_tests/tests/unit/_server_shutdown_test.py

@@ -74,6 +74,7 @@ class ServerShutdown(unittest.TestCase):
             stderr=sys.stderr)
         wait(process)
 
+    @unittest.skipIf(os.name == 'nt', 'fork not supported on windows')
     def test_server_fork_can_exit(self):
         process = subprocess.Popen(
             BASE_COMMAND + [_server_shutdown_scenarios.SERVER_FORK_CAN_EXIT],