Updated openstack/openstack
Project: openstack/oslo.i18n  ed7f42b5abd7278b8f83d4a21ed4102c667d3708

Fix coverage testing

Add coverage to test-requirements so that tox-e cover works - this
is part of the post jobs that are run.

Change-Id: I6896837f5d25f8f74c9170621494053ffddf06b6