Fix test_contrib_s3_core unit test
Fix test_contrib_s3_core unit test

When running the full suite of run_tests.sh the test_contrib_s3_core tests run
fine, however when run standalone the tests fail

Change-Id: I287d05aaab40f441dca9fdca0a5dc6bee1fd073d
Fixes: bug #1120896

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