zuul layout: include dib in zuul tenant for jobs
zuul layout: include dib in zuul tenant for jobs

To allow zuul projects to run and consume DIB docker images, import
the DIB jobs into the zuul tenant

Change-Id: I50fc12aac7e8011497e483b77c77981e832c101a

openstack-infra/project-config,openstack-infra/project-config