Reparent puppet-openstack-base to legacy-base

Base has been updated to not include thigns like zuul-cloner (which we
depend on). So we need to either remove the usage of this  by using the
repos in /home/zuul/src or set the base to legacy-base so zuul-cloner is
still included. For now let's just reparent the jobs and work on
removing zuul-cloner later.

http://lists.openstack.org/pipermail/openstack-discuss/2019-June/006888.html

Change-Id: Iba69f72b05e70806fc425b72a919d52fd368914d

zuul.d/base.yaml

@@ -77,6 +77,8 @@
 
 - job:
     name: puppet-openstack-base
+    # NOTE(mwhahaha): needed for zuul-cloner (we should probably remove this usage)
+    parent: legacy-base
     pre-run: playbooks/prepare-node-common.yaml
     abstract: true
     nodeset: ubuntu-bionic