[train] Switch to content provider jobs/templates

This change switches templates and jobs to the content provider
dependency relation so the jobs share the produced artifacts.

Change-Id: I6ec30e05c0c4f2ec32e2daeb76b06a42397f7550

zuul.d/layout.yaml

@@ -5,4 +5,4 @@
       - openstack-lower-constraints-jobs
       - openstack-python-jobs
       - openstack-python3-train-jobs
-      - tripleo-multinode-container-minimal
+      - tripleo-multinode-container-minimal-pipeline