Stop using tox to build python tarballs

The PTI for Python has been updated to no longer specify using tox to
build tarballs. Remove the bindep and tox steps in
publish-openstack-python-tarball.

Remove build-openstack-python-tarball - it was not being used anywhere.

Depends-On: Icfad9ad6ba5c7a0c62a8d5ce243952b81f28a47f
Change-Id: Ic46d077428bc77fb481bd63ae766d00c4bdae0c2

playbooks/python-tarball/pre.yaml

@@ -1,7 +0,0 @@
-- hosts: all
-  roles:
-    - role: bindep
-      bindep_profile: test
-      bindep_dir: "src/{{ zuul.project.canonical_name }}"
-    - revoke-sudo
-    - ensure-tox

playbooks/python-tarball/run.yaml

@@ -1,6 +1,3 @@
 - hosts: all
   roles:
-    - role: tox
-      tox_extra_args: -vv python setup.py sdist
-    - role: tox
-      tox_extra_args: -vv python setup.py bdist_wheel
+    - build-python-release

zuul.d/jobs.yaml

@@ -414,17 +414,9 @@
     parent: publish-openstack-artifacts
     description: |
       Publish the results of the tox-tarball job to tarballs.openstack.org.
-    pre-run: playbooks/python-tarball/pre.yaml
     run: playbooks/python-tarball/run.yaml
     post-run: playbooks/python-tarball/post.yaml
 
-- job:
-    name: build-openstack-python-tarball
-    parent: python-sdist
-    description: |
-      Build a tarball using tox but do not upload it anywhere.
-    pre-run: playbooks/python-tarball/pre.yaml
-    run: playbooks/python-tarball/run.yaml
 
 - job:
     name: publish-openstack-javascript-tarball