Implement base configuration for independent repository
neutron-ha-tool.py.j2 has been updated to resolve flake8 violations.
This includes removing the venv activation code, by implementing the
following change: https://review.openstack.org/#/c/275279/
Pep8 'E501: line too long' has been added to the ignore list since the
Jinja2 templated shebang line now exceeds 79 characters.