juju-wait should stop waiting when a workload status goes to error

[Jason Hobbs]

juju-wait should give up waiting if a service or unit goes into error status. It can do this right now only if workload-status is being monitored for being active, but this would have value in other times too.

For example, in OIL, not all of the charms we're deploying have workload status implemented - some leave it unknown, so we can't monitor workload status. But, we still want juju-wait to exit whenever there is an error in a charm. Eventually it will exit because we have a timeout, but we would like it to exit immediately so we can clean up the job and deploy something else.

[Cory Johns (johnsca)]

There's some issue with this, though, in that Juju 2.x will automatically retry hook failures and transient issues shouldn't necessarily block a deployment. See https://bugs.launchpad.net/juju-wait/+bug/1680963