Integrate openstack/common logging and cfg with congress

This patch starts the integration with the common openstack libraries
for logging and config management.

Other places in the source tree still need to be converted over
(datasources/dse/policy/tests) which should be straight forward
though I prefer to do these segements in a later commit once
I figure out how these seconds work.

Part of blueprint integrate-oslo-config-and-logging

Change-Id: I24948f157733a3ee0a25b03703ff0e1d87005832
Merge "Integrate openstack/common logging and cfg with congress"