fix import order in federation controller
fix import order in federation controller

the oslo config import should be amongst the other 3rd party
imports.

Change-Id: I84a6e6ec64e5fd0f8740508e2896ab3f687261ff

nuxeh/keystone,dstanek/keystone,ajayaa/keystone,klmitch/keystone,rajalokan/keystone,jonnary/keystone,jumpstarter-io/keystone,openstack/keystone,ajayaa/keystone,ilay09/keystone,cernops/keystone,jamielennox/keystone,mahak/keystone,mahak/keystone,rushiagr/keystone,openstack/keystone,cernops/keystone,promptworks/keystone,himanshu-setia/keystone,takeshineshiro/keystone,rushiagr/keystone,jumpstarter-io/keystone,ilay09/keystone,jamielennox/keystone,vivekdhayaal/keystone,mahak/keystone,rushiagr/keystone,openstack/keystone,idjaw/keystone,roopali8/keystone,dims/keystone,nuxeh/keystone,promptworks/keystone,dstanek/keystone,rajalokan/keystone,roopali8/keystone,himanshu-setia/keystone,jumpstarter-io/keystone,vivekdhayaal/keystone,jonnary/keystone,promptworks/keystone,ilay09/keystone,rajalokan/keystone,dstanek/keystone,maestro-hybrid-cloud/keystone,idjaw/keystone,maestro-hybrid-cloud/keystone,takeshineshiro/keystone,dims/keystone,nuxeh/keystone,klmitch/keystone,vivekdhayaal/keystone