Confusing error message during install when K8s cluster is still initializing #115
Description
Describe the bug
After installing the cluster to GKE, it upgrades itself creating the node pools taking the cluster offline for a few minutes. If you try and run install-gke.sh at this time it fails with the misleading error "It looks like you are not logged into a Kubernetes cluster. Please 'gcloud init' before running the installer." The install script assumes any error returned by kubectl get pods command is related to authentication, which isn't always the case.
Expected behavior
The script should preferably detect that the cluster is not finished initialization or, if that is not possible, the error message should indicate this might be the case and advise the user to verify this and perhaps wait a little bit for the initialization to finish.