Prevent false positives of UPDATE_COMPLETE in integration tests
Prevent false positives of UPDATE_COMPLETE in integration tests

Use the updated_at field in the stack output to check for
false positives of UPDATE_COMPLETE.

Partially-Closes Bug: #1433340

Change-Id: I8e68a2764741cc19305a0db7825322807b6508f3

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