ReST API: Add a keystone endpoint
ReST API: Add a keystone endpoint

Change-Id: I2770279ec50822c106d3ae23ce2f736a49139443
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

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