title: kops validate cluster: returns "cluster not found" even though cluster is healthy and kubectl works fine
body: <p>I created a cluster using kops.  It worked fine and the cluster is healthy.  I can see my nodes using kubectl and have created some deployments and services.  I tried adding a node using "kops edit ig nodes" and got an error "cluster  not found".  Now I get that error for all kops commands:</p>
  
  <pre><code>kops validate cluster
  Using cluster from kubectl context: &lt;clustername&gt;
  
  cluster "&lt;clustername&gt;" not found
  </code></pre>
  
  <p>So my question is: where does kops look for clusters and how do I configure it to see my cluster.</p>