Updated openstack/openstack
Project: openstack-infra/devstack-gate  17852b12544e90310c7fdecdf2f90fd32e91b995
null
Test matrix generation for feature branches.

The previous change to fix test matrix generation did not include a
test. Add a test here so that this does not regress.

Change-Id: Ib267a435fa0f28e50a83437d96ad0ef321ba6f46