Publish oslo-config tarballs

It looks like oslo-config isn't set up to publish tarballs. There is
no master tarball on tarballs.o.o and the 2013.1b tag I pushed
didn't cause a pre-release tarball to be generated.

Change-Id: Ida97da5def80c03da7e020df941d681464ec993b
Reviewed-on: https://review.openstack.org/21599
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins