FFU: add fast forward upgrade support for sensu client
FFU: add fast forward upgrade support for sensu client

bp fast-forward-upgrades

Change-Id: I5b09f20aa273904cf7a0949e10ca9137827a4957

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates