test attribute update edge cases
test attribute update edge cases

Change-Id: Iba21cd6587e1740cbede645b146ca206d9acd821

UTSA-ICS/keystone-kerberos,roopali8/keystone,JioCloud/keystone,takeshineshiro/keystone,blueboxgroup/keystone,mahak/keystone,derekchiang/keystone,ilay09/keystone,klmitch/keystone,maestro-hybrid-cloud/keystone,dstanek/keystone,reeshupatel/demo,MaheshIBM/keystone,jamielennox/keystone,openstack/keystone,mahak/keystone,derekchiang/keystone,jonnary/keystone,dsiddharth/access-keys,promptworks/keystone,promptworks/keystone,reeshupatel/demo,JioCloud/keystone,openstack/keystone,dims/keystone,idjaw/keystone,rushiagr/keystone,ilay09/keystone,vivekdhayaal/keystone,maestro-hybrid-cloud/keystone,reeshupatel/demo,cloudbau/keystone,takeshineshiro/keystone,rushiagr/keystone,dsiddharth/access-keys,vivekdhayaal/keystone,cernops/keystone,ajayaa/keystone,promptworks/keystone,jumpstarter-io/keystone,klmitch/keystone,cernops/keystone,mahak/keystone,rushiagr/keystone,nuxeh/keystone,jumpstarter-io/keystone,dstanek/keystone,ging/keystone,jamielennox/keystone,vivekdhayaal/keystone,jumpstarter-io/keystone,derekchiang/keystone,rajalokan/keystone,rajalokan/keystone,ajayaa/keystone,nuxeh/keystone,dsiddharth/access-keys,roopali8/keystone,blueboxgroup/keystone,cloudbau/keystone,rajalokan/keystone,rodrigods/keystone,openstack/keystone,rodrigods/keystone,himanshu-setia/keystone,dstanek/keystone,MaheshIBM/keystone,UTSA-ICS/keystone-kerberos,cloudbau/keystone,dims/keystone,ging/keystone,idjaw/keystone,himanshu-setia/keystone,nuxeh/keystone,ilay09/keystone,jonnary/keystone