Remove unnecessary nosetest param
Remove unnecessary nosetest param

cover-package = astara already specified in setup.cfg, no need to
specify in tox.ini.

Change-Id: I7e595f74fa71a6af145d4764add981196b12f06f

stackforge/akanda-rug,stackforge/akanda-rug,openstack/akanda-rug,openstack/akanda-rug