I tested manually openstack-nova-14.1.0-56* package family on 2019-08-27.2 puddle (14.1.0-55) and it seems to be solving the issue with "tempest.scenario.test_snapshot_pattern.TestSnapshotPattern.test_snapshot_pattern" Tempest test. I'll do deeper testing for flakyness overnight, but if not said otherwise, this can go straight from on_qa to verified then.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2019:2631