Updated openstack/openstack
Project: openstack/oslo.config  5b5df642f0b9f6f7c50a25e15290bb531b72c1d0

add tests coverage for an oslo.messaging use case

This change adds tests to checks the behavior when an
option in two groups shares the same deprecated group.

oslo.messaging usage: https://review.openstack.org/#/c/120038/

Change-Id: I47b4fae15bc6f4581b513e9c10a564f4f4a88e2f