title: Headless services with selector does not get endpoint
body: <p>on GKE I created some pods and a headless service. The headless service has a selector and I am expecting the endpoint to get the IP of the Pod that matches the selector.</p>
  
  <p>However the endpoint remains empty</p>
  
  <pre><code>$ kubectl get pods -lservice=front-end
  NAME                         READY     STATUS    RESTARTS   AGE
  front-end-1567472915-tei91   1/1       Running   0          12m
  $ kubectl get svc -lapp=sockshop
  NAME        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
  front-end   None         &lt;none&gt;                  11m
  $ kubectl get endpoints -lapp=sockshop
  NAME        ENDPOINTS   AGE
  front-end   &lt;none&gt;      11m
  $ more svc.yaml 
  apiVersion: v1
  kind: Service
  metadata:
    labels:
      app: sockshop
    name: front-end
  spec:
    clusterIP: None
    ports: null
    selector:
      service: front-end
  </code></pre>
  
  <p>I would expect an endpoint to get the IP of the Pod so that the DNS registration works.</p>