- Update the version of setuptools pinned in certbot-auto to 40.6.3 to solve installation problems on newer OSes.
- Always download the pinned version of pip in pipstrap to address breakages
- Rename old,default.conf to old-and-default.conf to address commas in filenames breaking recent versions of pip.
- Add VIRTUALENV_NO_DOWNLOAD=1 to all calls to virtualenv to address breakages from venv downloading the latest pip
Signed-off-by: Pierre-Yves <pyu@riseup.net>