Made the token schema extensible.
Made the token schema extensible.

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