[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: I3f0385457bae07a5386da9ee52c7ad94b3fc3a89

zuul.d/layout.yaml

@@ -4,4 +4,4 @@
       - openstack-cover-jobs
       - openstack-python-jobs
       - openstack-python3-train-jobs
-      - tripleo-multinode-container-minimal
+      - tripleo-multinode-container-minimal-pipeline