heat : Only set qpid loglevel when rpc_backend specifies qpid
heat : Only set qpid loglevel when rpc_backend specifies qpid

fixes bug 1132709

Change-Id: Iefad8be07ab806b17f04ff536af955dc015ee4be

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