heat tests : Add ValidateTemplate test to CFN_API_Actions test
heat tests : Add ValidateTemplate test to CFN_API_Actions test

Add test for ValidateTemplate action to test_CFN_API_Actions.py

Change-Id: Ia7a377f952d096e7b728a7151906ab2781695008
Signed-off-by: Steven Hardy <4d1810d1ff6d7f22d774341c4549c02173d2f2ab@redhat.com>

pratikmallya/heat,redhat-openstack/heat,dragorosson/heat,Triv90/Heat,openstack/heat,steveb/heat,maestro-hybrid-cloud/heat,NeCTAR-RC/heat,citrix-openstack-build/heat,JioCloud/heat,JioCloud/heat,NeCTAR-RC/heat,cwolferh/heat-scratch,dragorosson/heat,ntt-sic/heat,gonzolino/heat,varunarya10/heat,miguelgrinberg/heat,jasondunsmore/heat,citrix-openstack-build/heat,varunarya10/heat,Triv90/Heat,openstack/heat,redhat-openstack/heat,rickerc/heat_audit,maestro-hybrid-cloud/heat,srznew/heat,rdo-management/heat,takeshineshiro/heat,pshchelo/heat,takeshineshiro/heat,pratikmallya/heat,pshchelo/heat,miguelgrinberg/heat,cwolferh/heat-scratch,rickerc/heat_audit,srznew/heat,cryptickp/heat,steveb/heat,rh-s/heat,gonzolino/heat,Triv90/Heat,dims/heat,cryptickp/heat,rh-s/heat,ntt-sic/heat,noironetworks/heat,rdo-management/heat,dims/heat,jasondunsmore/heat,noironetworks/heat