When troubleshooting, it's often interesting to see the deltas between
the default or sample configs and the running configuration. The
oslo_config.validator is a great tool to integrate this feature across
all projects. It can also be easily captured by data collection tools
like sosreports with the current deployment packages.
Change-Id: I172d82f19a81282093b0d5f7ae4c1817801cd887
Signed-off-by: David Vallee Delisle <dvd@redhat.com>