Fix kubeflow#276 (kubeflow#277)

* add kubeflow_label.yml for label sycn across repos in kubeflow, along with helper script to generate it.

* reformat process_label.py to fix pylint check

* handle code review feedback & change code to python3

* Enable image auto release -- testing repo part

* formating py following pylint

* update image version tag format

* fix presubmit

py/kubeflow/testing/test_jsonnet_formatting.py

@@ -26,7 +26,7 @@ def parse_args():
     default="",
     type=str,
     help="Comma separated directories which should be excluded from the test")
-  args = parser.parse_args()
+  args, _ = parser.parse_known_args()
   return args