If there are multiple charms of a given application then a hook
like leader-settings-changed can trigger a deferred hook. So a
race can occur where the deferred hooks of unit1 are cleared
then in the process of clearing unit2 a deferred hook is
triggerred in unit1. To fix this do not block on the wl status
message after the hook test completes.
Also, make sure that an action failure is fatal to surface any
issues.
Liam Young
8a04739912