Removes some duplicate setup from a testcase
Removes some duplicate setup from a testcase

TestTokenRevokeSelfAndAdmin.load_sample_data was populating the default
domain unnecessarily. It was already being populated by the parent class
RestfulTestCase.

Change-Id: I0af0947dcff00f0594227227c6c8ee7e41813f6e

takeshineshiro/keystone,jumpstarter-io/keystone,mahak/keystone,vivekdhayaal/keystone,idjaw/keystone,ajayaa/keystone,MaheshIBM/keystone,nuxeh/keystone,nuxeh/keystone,openstack/keystone,maestro-hybrid-cloud/keystone,cernops/keystone,openstack/keystone,himanshu-setia/keystone,blueboxgroup/keystone,jamielennox/keystone,UTSA-ICS/keystone-kerberos,nuxeh/keystone,maestro-hybrid-cloud/keystone,ilay09/keystone,promptworks/keystone,UTSA-ICS/keystone-kerberos,takeshineshiro/keystone,ging/keystone,jumpstarter-io/keystone,jonnary/keystone,rajalokan/keystone,dstanek/keystone,reeshupatel/demo,idjaw/keystone,cernops/keystone,rushiagr/keystone,dims/keystone,ging/keystone,jonnary/keystone,rodrigods/keystone,rajalokan/keystone,himanshu-setia/keystone,MaheshIBM/keystone,rushiagr/keystone,reeshupatel/demo,rajalokan/keystone,mahak/keystone,jamielennox/keystone,rushiagr/keystone,reeshupatel/demo,dims/keystone,roopali8/keystone,dstanek/keystone,mahak/keystone,dstanek/keystone,ilay09/keystone,openstack/keystone,klmitch/keystone,rodrigods/keystone,promptworks/keystone,jumpstarter-io/keystone,vivekdhayaal/keystone,promptworks/keystone,ilay09/keystone,roopali8/keystone,blueboxgroup/keystone,ajayaa/keystone,klmitch/keystone,vivekdhayaal/keystone