update redis image address

Author: runzexia

staging/storage/redis/redis-master.yaml

@@ -22,7 +22,7 @@ spec:
         - mountPath: /redis-master-data
           name: data
     - name: sentinel
-      image: kubernetes/redis:v1
+      image: k8s.gcr.io/redis:v1
       env:
         - name: SENTINEL
           value: "true"