Fix identify_stack call
Fix identify_stack call

It needs to return a dictionary in order for the result to be converted to
JSON.

Change-Id: Ieef360fd6872624325470fab626d371ed28535e6
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

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