Fix auth_token middleware: make _verify_claims not static. Fixes bug #901049.
Fix auth_token middleware: make _verify_claims not static. Fixes bug #901049.

Change-Id: I8498b8c89a5818a7dcca3f74aa98289d957eac74

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