Update test_keystone_manage to use unittest2.
Update test_keystone_manage to use unittest2.

Change-Id: Ice620e0201f45f63fa09568913fc34612a6b458e

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