Align active status message with other OpenStack related charms,
ensuring a consistent user experience and aligning with monitoring
code checks in amulet functional test helpers.
Change-Id: I97324c80e0c5a4ea406c9a53b1bb80a7e4234661
Closes-Bug: 1632095
This charm was written when the reactive framework was in its infancy
and the layers for Openstack had not been written. This change
updates the charm to use the new layout and removes code which now
resides in a shared layer. The unit tests have also been updated and
extended.
Change-Id: Ib75710021aa48fb739c6fbca8ef52bf296d2a26a