Use gubernator.k8s.io instead of k8s-gubernator.appspot.com
Use gubernator.k8s.io instead of k8s-gubernator.appspot.com

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid