update service.json in persistent-volume example to v1beta3

persistent-volumes/simpletest/service.json

@@ -1,9 +1,19 @@
 {
-    "apiVersion": "v1beta1",
   "kind": "Service",
-    "id": "frontendservice",
+  "apiVersion": "v1beta3",
+  "metadata": {
+    "name": "frontendservice"
+  },
+  "spec": {
+    "ports": [
+      {
+        "protocol": "TCP",
         "port": 3000,
-    "containerPort": "http-server",
+        "targetPort": "http-server"
-    "selector": { "name": "frontendhttp" },
+      }
-    "createExternalLoadBalancer": false
+    ],
+    "selector": {
+      "name": "frontendhttp"
+    }
+  }
 }