pep-8 cleanup of model
pep-8 cleanup of model

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