heat tests : split user test into User/AccessKey
heat tests : split user test into User/AccessKey

The test is testing two classes, User and AccessKey,
so make the tests separate

Change-Id: I79e183381ce69e2d2d564c254b2f903b60672e33
Signed-off-by: Steven Hardy <4d1810d1ff6d7f22d774341c4549c02173d2f2ab@redhat.com>

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