Comment 2 for bug 1803451

Reviewed: https://review.openstack.org/618117
Committed: https://git.openstack.org/cgit/openstack/charms.openstack/commit/?id=b75c8b416167d4bfa039a004532975630c50d90d
Submitter: Zuul
Branch: master

commit b75c8b416167d4bfa039a004532975630c50d90d
Author: James Page <email address hidden>
Date: Thu Nov 15 09:58:58 2018 +0000

    Deal with obsolete packages during charm upgrade

    For Rocky, we switch the payload execution environent from py2->py3
    post initial charm release; ensure that any existing py2 based
    deployments are automatically switched over to py3 during any
    charm upgrade.

    This is implemented in the default upgrade-charm handler code; if
    packages are removed as part of the upgrade, all services associated
    with the charm will be restarted.

    Change-Id: Ib5f11d21dd26cb2918f5d5044ed56d688bba3b5d
    Closes-Bug: 1803451