Abstract rpc 'create_stack' call mock method
Abstract rpc 'create_stack' call mock method

Abstract 'create_stack' rpc call mock method for 
test_api_cfn_v1.py.

Change-Id: I94b117bf2d142ff1a67affec503d9cfdb8a558cc

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