Clean StatsController unnecesary members
Clean StatsController unnecesary members

Removed from StatsController unused members

identity_api, policy_api, token_api

Closes-Bug: #1255990
Change-Id: I0edfe5ce270a2d88dc33273a05c9f13eb379c052

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