Stop using deprecated 'oslo' namespace
Stop using deprecated 'oslo' namespace

Replace usage of deprecated 'oslo' namespace with appropriate 'oslo_*'
namespaces in Manila setup.cfg file.

Change-Id: I3fbe75023d3dec266c0121df436639a2041eadd5

openstack/manila,NetApp/manila,bswartz/manila,redhat-openstack/manila,vponomaryov/manila,jcsp/manila,sajuptpm/manila,weiting-chen/manila,bswartz/manila,redhat-openstack/manila,scality/manila,scality/manila,vponomaryov/manila,jcsp/manila,NetApp/manila,sajuptpm/manila,openstack/manila,weiting-chen/manila