It turns out the linters rename was a bit premature[1]. Use the
current standard pep8 name so we don't need custom jobs in the
gate to run this test on proposed changes.
Change-Id: I5226d4c5e3d4095d76cba24fcf27f87c59730587
1: http://lists.openstack.org/pipermail/openstack-dev/2016-February/086268.html
[testenv:venv]
commands = {posargs}
-[testenv:linters]
+[testenv:pep8]
commands = python ./tools/yaml-validate.py .