Update oslo.cfg to >= 1.2.0
Update oslo.cfg to >= 1.2.0

Need a newer version of Oslo.cfg so we can use DictOpt.

fixes bug 1213192

Change-Id: I9d41d6184c57ecec46403390fac972bd9e76ab17

zhujzhuo/openstack-trove,zhangg/trove,fabian4/trove,zhujzhuo/openstack-trove,changsimon/trove,redhat-openstack/trove,redhat-openstack/trove,openstack/trove,hplustree/trove,citrix-openstack/build-trove,citrix-openstack-build/trove,citrix-openstack-build/trove,mmasaki/trove,mmasaki/trove,citrix-openstack/build-trove,denismakogon/trove-guestagent,changsimon/trove,zhujzhuo/openstack-trove,zhangg/trove,citrix-openstack/build-trove,citrix-openstack-build/trove,mmasaki/trove,fabian4/trove,cp16net/trove,hplustree/trove,changsimon/trove,denismakogon/trove-guestagent,cp16net/trove,openstack/trove,fabian4/trove,cp16net/trove,redhat-openstack/trove