Cleanup i18n marker functions to match Oslo docs
Cleanup i18n marker functions to match Oslo docs

Define marker functions as per documentation.
http://docs.openstack.org/developer/oslo.i18n/usage.html

Change-Id: I79c0e11ebfa7b10a0c95836600a6d8cb97cc7c4c

stackforge/senlin,openstack/senlin,stackforge/senlin,openstack/senlin,openstack/senlin