Add basic stack-preview functional test
Add basic stack-preview functional test

Change-Id: I401bc78488f62fe4d4674ae2d32678cce0242a56
Closes-bug: #1479594

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