Fix JJB compilation failures.

python-libraclient was missing a definition for tarball-site which was
breaking JJB when it tried to compile python-jobs for that project. Add
a tarball site to correct this.

Change-Id: I842309d556a713a4532d834e05cee47782e67242
Reviewed-on: https://review.openstack.org/19217
Reviewed-by: Kiall Mac Innes <kiall@hp.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins