title: Submariner “Discovering network details CIDR” did not complete
body: <p>I am running subctl from a VM like below to join an EKS Cluster. Note: VM is not in EKC VPC, it is external.
  Unfortunately, it ran for more than a few hours with no luck.</p>
  <pre><code>ec2-user@ip-10-0-0-59 ~]$ subctl join --kubeconfig /home/ec2-user/.kube/config broker-info.subm
  * broker-info.subm says broker is at: https://6E23D7565331B5BEE5DD851EEFF1E19E.gr7.ap-southeast-2.eks.amazonaws.com
  ? What is your cluster ID? d837265
  X Sorry, your reply was invalid: Value is required
  ⠈⠁ Discovering network details CIDR for your cluster?
  Error determining the service CIDR: interruptcluster?
  
  subctl version: v0.6.1
  </code></pre>
  <p>Any help will be appreciated.</p>