Update to latest openstack.common.setup code.

Change-Id: Iaf8d066e9ad670dc5fed2375ad5640682a387bb5
Reviewed-on: https://review.openstack.org/25533
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins