Remove extra publish-openstack-python-branch-tarball job
Remove extra publish-openstack-python-branch-tarball job

With change https://review.openstack.org/609098 merged, we do not need
required-projects for publish-openstack-python-branch-tarball anymore.

The job can now be removed completely from the post pipeline since it
is part of the python-jobs template.

Change-Id: I72870473e64c8fa96b60499095a131c6629b599b

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl