Remove enumerate calls
Remove enumerate calls

Refactor keystone/tests/test_v3_auth.py, remove all useless enumerate
calls in for loop. To make codes cleaner.

Change-Id: I16d6796fb37b543c1301c2f35129384f2e0ff782

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