Sync common modules from Oslo

Oslo version:
commit  63278ca
Author: OpenStack Proposal Bot <openstack-infra@lists.openstack.org>
Date:   Tue Jul 22 16:44:51 2014 +0000
Name:   Updated from global requirements

key changes:
- copied latest versions of existing modules
- added new module from common code - systemd
- updated openstack-common.conf to be consistent with really used modules

Change-Id: I997f9e8192514230862babc086397b1456bfb5f6