Updated openstack/openstack
Project: openstack/tempest  580f83ef7e9dda3a1b9d77b168d0a35eabcfeb1f
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Add a unit test coverage tox job

This commit adds a new tox job for running the tempest unit tests with
coverage enabled.

Change-Id: I36b5390ffd241e08e40be2d4b92b9e91a71cdc9e