title: imagePullSecrets not working with Kind deployment
body: <p>I'm tying to create a deployment with 3 replicas, whcih will pull image from a private registry. I have stored the credentials in a secret and using the  imagePullSecrets in the deployment file. Im getting below error in the deploy it.</p>
  
  <p>error: error validating "private-reg-pod.yaml": error validating data: [ValidationError(Deployment.spec): unknown field "containers" in io.k8s.api.apps.v1.DeploymentSpec, ValidationError(Deployment.spec): unknown field "imagePullSecrets" in io.k8s.api.apps.v1.DeploymentSpec, ValidationError(Deployment.spec): missing required field "selector" in io.k8s.api.apps.v1.DeploymentSpec, ValidationError(Deployment.spec): missing required field "template" in io.k8s.api.apps.v1.DeploymentSpec]; if you choose to ignore these errors, turn validation off with --validate=false</p>
  
  <p>Any help on this?</p>
  
  <p>Below is my deployment file :</p>
  
  <pre><code>apiVersion: extensions/v1beta1
  kind: Deployment
  metadata:
    name: test-pod-deployment
    labels:
      app: test-pod
  spec:
    replicas: 3
    selector:
      matchLabels:
        app: test-pod
    template:
      metadata:
        labels:
          app: test-pod
      spec:
        containers:
        - name: test-pod
      image: &lt;private-registry&gt;
    imagePullSecrets:
    - name: regcred
  </code></pre>
  
  <p>Thanks,
  Sundar</p>