make "python setup.py test" work
make "python setup.py test" work

Integrate pytest into setuptools, a la
https://pytest.org/latest/goodpractises.html

barreyo/jenkins-job-wrecker,skybet/jenkins-job-wrecker,alfredodeza/jenkins-job-wrecker,ktdreyer/jenkins-job-wrecker,notnownikki/jenkins-job-wrecker