Remove unused member from KVS assignment
Remove unused member from KVS assignment

The KVS assignment backend's _get_user_by_name method was not used.
This change removes it.

Change-Id: I357adf745095b2ac868c3c6eb78e4ab6db2ca0fc

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