- assure we test triple-jobs-gerrit.py file
- fix division by zero bug with above file
- simplified tox.ini file
- prevent accidental regression on CI by checking number of passed tests
- removed test_molecule.py file which was the precursor of what later
become pytest-molecule
Change-Id: Id6ffb9df88a376bcd3c8a0d77b2d378fca8da115