Revert k8s.gcr.io vanity domain

This reverts commit eba5b6092a.

Fixes https://github.com/kubernetes/kubernetes/issues/57526

cluster/addons/metrics-server/metrics-server-deployment.yaml

@@ -47,7 +47,7 @@ spec:
       serviceAccountName: metrics-server
       containers:
       - name: metrics-server
-        image: k8s.gcr.io/metrics-server-amd64:v0.2.0
+        image: gcr.io/google_containers/metrics-server-amd64:v0.2.0
         command:
         - /metrics-server
         - --source=kubernetes.summary_api:''
@@ -56,7 +56,7 @@ spec:
           name: https
           protocol: TCP
       - name: metrics-server-nanny
-        image: k8s.gcr.io/addon-resizer:1.8.1
+        image: gcr.io/google_containers/addon-resizer:1.8.1
         resources:
           limits:
             cpu: 100m