This will add a value override for neutron_netns_cleanup_cron release image so that we don't use stein release images by default in the respective Openstack release jobs.
Change-Id: Ie856090ac3ed2f8c60afeacc2ed729c36b7d3372
This change adds the overrides needed to run both the Xena and
Yoga releases in the OSH zuul jobs.
Change-Id: I65e016a4cb3fd52707ab29c37f025818fcb6c405