Update oslo-config version.
Update oslo-config version.

Update the version of oslo-config in pip-requires.  This update includes
a fix for a bug that breaks oslo.config imports.

Change-Id: I2e31d3980c495b1fd16db5488c7d3c982ce069ac

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