pylint fixes for role api
pylint fixes for role api

Change-Id: Id39a117a49ebc560b6e50fb0ed4db7691794899c

dims/keystone,roopali8/keystone,rushiagr/keystone,dsiddharth/access-keys,blueboxgroup/keystone,MaheshIBM/keystone,mahak/keystone,klmitch/keystone,savi-dev/keystone,rickerc/keystone_audit,vivekdhayaal/keystone,openstack/keystone,rajalokan/keystone,cbrucks/Federated_Keystone,reeshupatel/demo,maestro-hybrid-cloud/keystone,jamielennox/keystone,cernops/keystone,cloudbau/keystone,jonnary/keystone,cbrucks/Federated_Keystone,promptworks/keystone,ntt-pf-lab/backup_keystone,dstanek/keystone,citrix-openstack-build/keystone,sileht/deb-openstack-keystone,ajayaa/keystone,JioCloud/keystone,idjaw/keystone,nuxeh/keystone,admiyo/keystone,JioCloud/keystone,klmitch/keystone,jamielennox/keystone,idjaw/keystone,reeshupatel/demo,kwss/keystone,vivekdhayaal/keystone,citrix-openstack-build/keystone,ntt-pf-lab/backup_keystone,derekchiang/keystone,mahak/keystone,derekchiang/keystone,cloudbau/keystone,rickerc/keystone_audit,cbrucks/keystone_ldap,rushiagr/keystone,cbrucks/keystone_ldap,pvo/keystone,ntt-sic/keystone,ging/keystone,MaheshIBM/keystone,takeshineshiro/keystone,kwss/keystone,blueboxgroup/keystone,townbull/keystone-dtrust,ilay09/keystone,rodrigods/keystone,ajayaa/keystone,sileht/deb-openstack-keystone,cernops/keystone,ntt-sic/keystone,roopali8/keystone,takeshineshiro/keystone,cbrucks/keystone_ldap,rajalokan/keystone,jumpstarter-io/keystone,admiyo/keystone,kwss/keystone,dims/keystone,himanshu-setia/keystone,sileht/deb-openstack-keystone,derekchiang/keystone,citrix-openstack-build/keystone,savi-dev/keystone,jumpstarter-io/keystone,nuxeh/keystone,openstack/keystone,reeshupatel/demo,openstack/keystone,UTSA-ICS/keystone-kerberos,cbrucks/Federated_Keystone,jonnary/keystone,mahak/keystone,dsiddharth/access-keys,rajalokan/keystone,ntt-pf-lab/backup_keystone,nuxeh/keystone,townbull/keystone-dtrust,pvo/keystone,dstanek/keystone,ging/keystone,jumpstarter-io/keystone,cloudbau/keystone,admiyo/keystone,townbull/keystone-dtrust,promptworks/keystone,dsiddharth/access-keys,vivekdhayaal/keystone,maestro-hybrid-cloud/keystone,promptworks/keystone,himanshu-setia/keystone,rickerc/keystone_audit,rodrigods/keystone,pvo/keystone,ilay09/keystone,ilay09/keystone,UTSA-ICS/keystone-kerberos,ntt-sic/keystone,rushiagr/keystone,dstanek/keystone,savi-dev/keystone