conjure up stops on hook error even though juju retries

[adam-stokes]

I installed the Canonical Kubernetes bundle.

During the deployment of the charms, there was a hook error (etcd cluster relation joined error as stuff was starting up). Juju retried the hook and continued ok. But conjure-up gets stuck on the error:

"Oops, there was a problem with your install".... etc.

[mikemccracken]

dupe of #609