title: aks ingress address is empty
body: <p>I created a service call portal, then I create ingress:</p>
  
  <pre><code>apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
    name: portal-ingress
  spec:
    backend:
      serviceName: portal
      servicePort: 8080
  </code></pre>
  
  <p>but the address is empty:</p>
  
  <pre><code>NAME                     HOSTS     ADDRESS   PORTS     AGE
  portal-ingress           *                   80        33m
  </code></pre>