Update domain of k8s (#170)

* Update domain of k8s

* Update mirror

* Remove registry.k8s.io/kube-registry-proxy-amd64

hack/verify-k8s-prefix.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+file=$1
+
+cp ${file} ${file}.bak
+
+cat ${file} | grep k8s.gcr.io/ | sed 's#k8s.gcr.io/#registry.k8s.io/#' >>${file}.bak
+
+$(dirname "${BASH_SOURCE}")/fmt.sh ${file}.bak
+
+result=$(diff ${file} ${file}.bak)
+
+if [[ "${result}" != "" ]]; then
+    echo "Usually registry.k8s.io/* instead of k8s.gcr.io/*"
+    echo "Please run following command to fix the issue:"
+    echo "cat ${file} | sed 's#k8s.gcr.io/#registry.k8s.io/#' >${file}.bak"
+    echo "mv ${file}.bak ${file}"
+    echo "./hack/fmt.sh ${file}"
+
+    exit 1
+fi
+
+rm ${file}.bak