It prevents the requirements job from running, leaving users with
a confusing error message instead of the helpful one provided by
a failing requirements job.
Change-Id: I67faed4866261c90b29875d75054f8d7ebe29f8d
Reviewed-on: https://review.openstack.org/26490
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins