Optimize tox options
Optimize tox options

JIRA: NETVIRT-1232
Change-Id: I5f1e3c70678b98a97144ca1f7db3b3d6cba1f83b
Signed-off-by: Sam Hague <0bd82f91a319b8977788d8264eb020ecd4ace960@redhat.com>

opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt