pylint fixes for server unit tests
pylint fixes for server unit tests

Change-Id: I4806897a0a61f2900ba14a2d1f3aa0348207fd78

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