[c7-train] Switch c7 jobs to content provider

This change switches c7 jobs to the content provider
dependency relation so the jobs share the produced artifacts.

Change-Id: Ib6a76239b3a3463d85e810759fb1fdfad386fcb8

zuul.d/layout.yaml

@@ -21,7 +21,15 @@
       - tripleo-standalone-scenarios-pipeline
     check:
       jobs:
+        - tripleo-ci-centos-7-content-provider
         - tripleo-ci-centos-7-scenario007-multinode-oooq-container:
+            vars:
+              consumer_job: true
+              build_container_images: false
+              remove_tags:
+                - build
+            dependencies:
+              - tripleo-ci-centos-7-content-provider
             files:
               - ^manifests/profile/pacemaker/ovn.*$
               - ^manifests/profile/(base|pacemaker)/neutron/plugins/ml2/ovn.*$