Updated openstack/openstack
Project: openstack/glance  7f6ebfb99e05072c5d2f5799f040d58f03333df4

Use testr directly from tox

Invoking testr directly lets us pass arguments to it through tox so we
can, for example, only run a subset of the tests.

Change-Id: I21351880db0848b860e7c61d4a8c711be2a49de0