Change I7def8df68371deda0b75a685363c8a73b818dd45 removed one
line by mistake passing the openstack release var down to the zuul
jobs, so all jobs are currently running under ocata.
This patch restores the missing line, thus fixing the opensuse jobs
and making sure the other jobs run under the correct release.
Change-Id: Ia7a488928e521de1afb821f141d77d2b0268ff0a