Force close logging handler.

Allow tempdir cleanup to work as expected on Windows.

Author: tseaver

logging/unit_tests/test_client.py

@@ -568,6 +568,7 @@ def test_get_default_handler_app_engine(self):
             with _Monkey(_MUT, _LOG_PATH_TEMPLATE=temp_log_path):
                 with _Monkey(os, environ={_APPENGINE_FLEXIBLE_ENV_VM: 'True'}):
                     handler = client.get_default_handler()
+                    handler.close()  # allow tempdir cleanup on Windows
 
         self.assertIsInstance(handler, AppEngineHandler)