Revert k8s.gcr.io vanity domain

This reverts commit eba5b6092a.

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

hack/local-up-cluster.sh

@@ -752,7 +752,7 @@ function start_kubelet {
         --privileged=true \
         -i \
         --cidfile=$KUBELET_CIDFILE \
-        k8s.gcr.io/kubelet \
+        gcr.io/google_containers/kubelet \
         /kubelet --v=${LOG_LEVEL} --containerized ${priv_arg}--chaos-chance="${CHAOS_CHANCE}" --pod-manifest-path="${POD_MANIFEST_PATH}" --hostname-override="${HOSTNAME_OVERRIDE}" --cloud-provider="${CLOUD_PROVIDER}" --cloud-config="${CLOUD_CONFIG}" \ --address="127.0.0.1" --kubeconfig "$CERT_DIR"/kubelet.kubeconfig --port="$KUBELET_PORT"  --enable-controller-attach-detach="${ENABLE_CONTROLLER_ATTACH_DETACH}" &> $KUBELET_LOG &
     fi
 }