Hello! We we're seeing errors this morning on a job that nearly never fails. I think it was an issue with integration-slave-precise-1004 specifically. Example error: https://integration.wikimedia.org/ci/job/tox-flake8/12544/console .
```
17:47:07 [tox-flake8] $ /bin/bash -xe /tmp/hudson5229123272857915959.sh
17:47:07 + rm -fR log
17:47:07 + mkdir -p log
17:47:07 + set -o pipefail
17:47:07 + tee log/flake8.log
17:47:07 + PY_COLORS=1
17:47:07 + tox -v -e flake8
17:47:07 Traceback (most recent call last):
17:47:07 File "/usr/local/bin/tox", line 5, in <module>
17:47:07 from pkg_resources import load_entry_point
17:47:07 File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2707, in <module>
17:47:07 working_set.require(__requires__)
17:47:07 File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 686, in require
17:47:07 needed = self.resolve(parse_requirements(requirements))
17:47:07 File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 584, in resolve
17:47:07 raise DistributionNotFound(req)
17:47:07 pkg_resources.DistributionNotFound: py>=1.4.17
```