Avoid ValueError in 12.04 essex pkg (bug 988523)
Avoid ValueError in 12.04 essex pkg (bug 988523)

Change-Id: Icafe3e877efcfb326b607462de493739b2395365

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