openstack-ardana: fix std-min cloud8 jobs
openstack-ardana: fix std-min cloud8 jobs

Adds missing `std-min` model parameter value.

aspiers/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,gosipyan/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation