Updated openstack/openstack
Project: openstack/heat  905ff13906704ba615704c8e9ca07318b756e2b4

Abstract rpc 'create_stack' call mock method

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

Change-Id: I94b117bf2d142ff1a67affec503d9cfdb8a558cc