Add additional info for DEPRECATED objects
Add additional info for DEPRECATED objects

Add previous_status supporting in docs.

bp deprecating-improvements

Change-Id: I9cc33613d59b275a287630a5908cdf549dd061ca

pratikmallya/heat,rh-s/heat,maestro-hybrid-cloud/heat,miguelgrinberg/heat,cwolferh/heat-scratch,maestro-hybrid-cloud/heat,miguelgrinberg/heat,openstack/heat,steveb/heat,srznew/heat,jasondunsmore/heat,cryptickp/heat,cryptickp/heat,dragorosson/heat,srznew/heat,dims/heat,dims/heat,rh-s/heat,openstack/heat,takeshineshiro/heat,jasondunsmore/heat,gonzolino/heat,pratikmallya/heat,gonzolino/heat,takeshineshiro/heat,dragorosson/heat,noironetworks/heat,cwolferh/heat-scratch,steveb/heat,noironetworks/heat