Add a disto mapping to get the image name.
Add a disto mapping to get the image name.

Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

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