Don't get App URL until we fix the `KubernetesClient` bug
Sometimes users get a 401 from the Kubernetes API. This seems
to be caused by a bug/race condition in the way the kubernetes module
loads the configuration (this is our best theory so far)
It's annoying for users so avoiding this until we fix the problem.
PR: #754
Part of ticket: https://trello.com/c/D4bpabeD