Fix migration testcase 1-to-1 between stack and raw_template
Fix migration testcase 1-to-1 between stack and raw_template

Some of unit test case creates multiple stacks with same
raw_template id, which is invalid. This patch fixes this issue

Closes-bug: #1429029
Change-Id: I391e3dbc12197810580f0f22f778cdb2efdeec82

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