Remove data_files section from setup.py.
Remove data_files section from setup.py.

'data_files' is probably not the best way to get migrate.cfg into
the tarball. Updating MANIFEST.in seems to work just fine.

Fixes LP Bug #937265

Change-Id: I94e89271660baca4408df470a122e127540a4131

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