Comment 5 for bug 1417745

However, note that this is only required if you're running with oslo.messaging >= 1.5.0 but stable/juno global-requirements is capped at oslo.messaging < 1.5.0:

https://github.com/openstack/requirements/blob/stable/juno/global-requirements.txt#L65

So maybe not a good candidate for backport to stable/juno.