Remove tox-tarball job

This isn't really a general thing. We'll add a different thing in
openstack-zuul-jobs.

Change-Id: I7343977bd678c50a2ad1221692d56cafae3111f0

playbooks/tox/tarball.yaml

@@ -1,6 +0,0 @@
-- hosts: all
-  roles:
-    - role: tox
-      tox_extra_args: -vv python setup.py sdist
-    - role: tox
-      tox_extra_args: -vv python setup.py bdist_wheel

zuul.yaml

@@ -124,18 +124,6 @@
     run: playbooks/python/sdist.yaml
     post-run: playbooks/python/tarball-post
 
-- job:
-    name: tox-tarball
-    parent: tox
-    description: |
-      Generate a python source tarball and a binary wheel
-
-      Uses tox with the ``venv`` environment.
-    vars:
-      tox_envlist: venv
-    run: playbooks/tox/tarball
-    post-run: playbooks/python/tarball-post
-
 - job:
     name: python-upload-pypi
     parent: python-sdist