Make Jenkins to run all envs
Make Jenkins to run all envs

Instead of having three jobs in Jenkins that run:

1) flake8,flake8-py3
2) nose
3) nose34

Make it run all the environments in a single invocation.
Also add flake8-docstrings which was missing.

Outcome:

    $ JENKINS_URL=1 tox -l
    flake8
    flake8-py3
    flake8-docstrings
    nose
    nose34

Depends-On: Ic33236a9ff640c7a94c3feaf98bcd1b9d2c48867
Change-Id: I875f7d2304e08373722f3504a131be7aeb7f7da6

wikimedia/pywikibot-wikibase