We added nox somewhat recently and set it up to mimic existing tox jobs.
This meant adding py27 jobs. Since then (in OpenDev at least) only a
single project has used the py27 job: Bindep. Bindep is dropping support
for python2.7 as the need for it has come to an end. Additionally, nox
doesn't work with python2.7 out of the box due to a virtualenv
dependency that ends up being too new for python2.7 venv creation.
Rather than hack around that let's drop python2.7 job support.
Change-Id: I52c07b01ad173304c19b13a10927fdadf9d84170
Virtualenv dropped python2.7 support. When we install latest nox it also
installs latest virtualenv. Then when we try to run python2.7 jobs which
will create a python2.7 venv things fail with:
RuntimeError: failed to find interpreter for Builtin discover of python_spec='python2.7'
The underlying issue is that we are getting a too new virtualenv. Fix
this by adding a pre run step to the python2.7 jobs that downgrades to a
version of virtualenv that should support python2.7 environments.
Change-Id: I0ed9915b25c752cdaae4df19c9a0e0dc1aafd3d7
