Update api sources. Still need to regen documentation.

api/doc/service-schema.json

@@ -32,5 +32,9 @@
       "type": "object",
       "required": false
     }
+    "selector": {
+      "type": "object",
+      "required": false
+    }
   }
 }

api/examples/external-service.json

@@ -4,5 +4,8 @@
   "labels": {
      "name": "nginx"
   },
+  "selector": {
+     "name": "nginx"
+  },
   "createExternalLoadBalancer": true
 }

api/examples/service.json

@@ -4,4 +4,7 @@
   "labels": {
      "name": "nginx"
   }
+  "selector": {
+     "name": "nginx"
+  }
 }