Fix the coverage issue
Fix the coverage issue

Right now tox -e cover ends up in error. Using test instead of testr
will fix the issue. with this change it will also show the coverage
report after tox -e cover is being run.

test will use testr indirectly. the --coverage-package-name is not
supported by testr any more and this change will call it with right
package and syntax

Change-Id: I12b78145418da5df0c8ceb3cc94042c02c4b2d0f

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl,FedericoRessi/networking-odl,FedericoRessi/networking-odl