Parent legacy-gerrit-buck to legacy-base
Parent legacy-gerrit-buck to legacy-base

This currently fails with

  Unable to freeze job graph: Pre-review pipeline check does not allow
  post-review job legacy-gerrit-buck

because the artifacts parent is a protected job, so can't be in the
check pipeline.  I think what's happening here is that this job just
tests the build of the packages, and the -publish variant actually
wants to publish it.

Change-Id: I2111a29e28d091a365e65936ec34a909d8cce980

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs