Test Coil

[stevencox]

Use Pytest to create unit tests to verify we consistently send commands to the Chronos API for each job in a CWLTool workflow.

[theferrit32]

As part of testing, cwltool upstream uses Tox to test against various python versions to ensure compliance with them all.

I will go back and make the data_commons module backwards compatible with Python 2.7. There are some date and timezone things that python handles differently between versions 2/3.

[theferrit32]

Some unit tests have been created, and a jenkins job created to run them. A new build should be triggered within 10 min of a push to the github repo.

https://stars-app.renci.org/jenkins/job/data-commons/job/cwltool/