Add test_validate_ref for invalid and valid inputs
Add test_validate_ref for invalid and valid inputs

Signed-off-by: Steven Dake <8638f3fce5db0278cfbc239bd581dfc00c29ec9d@redhat.com>

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