This should allow us to build our own rest config in future,
rather than relying on the kubeconfig being configured correctly.
To do this, we need to stop sharing the factory between the channels
and kops commands.
We create a simple exec plugin command which can create and renew
short-lived admin credentials on the fly, essentially leveraging the
security of the underlying cloud credentials.
Co-authored-by: John Gardiner Myers <jgmyers@proofpoint.com>