twine: default to python3 install
The dependent change makes python3 default for ensure-twine, so this
argument is no longer required.
Depends-On:
- gpg_key
vars:
release_python: python3
- twine_python: python3
- job:
name: test-release-openstack
run: playbooks/pti-python-tarball/check.yaml
vars:
release_python: python3
- twine_python: python3
files:
- setup.cfg
- setup.py
