Correct concurrency of gabbi tests for gabbi 1.22.0
Correct concurrency of gabbi tests for gabbi 1.22.0

When running gabbi under testr, concurrency grouping is controlled
by a regex in .testr.conf. A module name change in gabbi 1.22.0
inadvertently broke the grouping. This change should work for
old and new versions.

Change-Id: Ie52d0714a453652f0497d34fb758473755e7bc49

stackforge/cloudkitty,openstack/cloudkitty,openstack/cloudkitty,stackforge/cloudkitty