Update to container image repo k8s.gcr.io

gcr.io/google_containers/ no longer contains some of the image
versions we require, use the new location.

Change-Id: I8f9a976a35ca632d785dd4d05f2a55713bde8c3e

tools/gate/config-templates/site-config.yaml

@@ -165,7 +165,7 @@ data:
     - --network-plugin=cni
     - --v=5
   images:
-    pause: gcr.io/google_containers/pause-amd64:3.1
+    pause: k8s.gcr.io/pause-amd64:3.1
   config_file_overrides:
     evictionMaxPodGracePeriod: -1
     nodeStatusUpdateFrequency: "5s"

tools/gate/default-config-env

@@ -8,6 +8,6 @@ IMAGE_DEP_CHECK=quay.io/stackanetes/kubernetes-entrypoint:v0.3.1
 IMAGE_ETCD=quay.io/coreos/etcd:v3.4.3
 IMAGE_HAPROXY=haproxy:1.8.3
 IMAGE_HELM=lachlanevenson/k8s-helm:v2.14.0
-IMAGE_HYPERKUBE=gcr.io/google_containers/hyperkube-amd64:v1.18.6
+IMAGE_HYPERKUBE=k8s.gcr.io/hyperkube-amd64:v1.18.6
 IMAGE_TILLER=gcr.io/kubernetes-helm/tiller:v2.16.1
 KUBELET_URL=https://dl.k8s.io/v1.18.6/kubernetes-node-linux-amd64.tar.gz