Explicitly use django_nose.NoseTestSuiteRunner
Explicitly use django_nose.NoseTestSuiteRunner

Horizon is going to switch to Django Test Runner [1].
To not break Watcher Dashboard we need to use Nose Test Runner
until we'll be ready to remove Nose from watcher-dashboard.

[1] https://review.openstack.org/#/c/544296/

Change-Id: Ia8a6c185cfea09e476c2f5fbe134cc84f450c096

openstack/watcher-dashboard,openstack/watcher-dashboard,openstack/watcher-dashboard,openstack/watcher-dashboard