Let the cover venv run individual tests.
Let the cover venv run individual tests.

Also, delete cruft from tox.ini while we're in there.

Change-Id: I8fe43695bb25b9c5eec10711b12d2002f1237e52

moshele/networking-mlnx-master,moshele/networking-mlnx,openstack/networking-mlnx,openstack/networking-mlnx,stackforge/networking-mlnx,stackforge/networking-mlnx