Added content nagotiation.
Added content nagotiation.

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