[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.

It also simplifies tags by using remove_tags instead.

Change-Id: I39a0a40fb4a507ef5c25155bdfdb8ef6757afe22

zuul.d/layout.yaml

@@ -12,37 +12,28 @@
       jobs:
         - openstack-tox-pep8
         - openstack-tox-lower-constraints
-        - tripleo-ci-centos-8-content-provider:
+        - tripleo-ci-centos-7-content-provider:
             dependencies: &deps_unit_lint
               - openstack-tox-pep8
-        - tripleo-ci-centos-7-containers-multinode:
+        - tripleo-ci-centos-8-content-provider:
             dependencies: *deps_unit_lint
-        - tripleo-ci-centos-8-containers-multinode:
+        - tripleo-ci-centos-7-containers-multinode:
             vars: &multi_consumer_vars
               consumer_job: true
               build_container_images: false
-              tags:
-                - undercloud-setup
-                - undercloud-scripts
-                - undercloud-install
-                - undercloud-post-install
-                - tripleo-validations
-                - overcloud-scripts
-                - overcloud-prep-config
-                - overcloud-prep-containers
-                - overcloud-deploy
-                - overcloud-post-deploy
-                - overcloud-validate
+              remove_tags:
+                - build
+            dependencies: &deps_cprovider_c7
+              - tripleo-ci-centos-7-content-provider
+        - tripleo-ci-centos-8-containers-multinode:
+            vars: *multi_consumer_vars
             dependencies: &deps_cprovider
               - tripleo-ci-centos-8-content-provider
         - tripleo-ci-centos-8-undercloud-containers:
             vars: &undercloud_consumer_vars
               consumer_job: true
-              tags:
-              - undercloud-setup
-              - undercloud-scripts
-              - undercloud-install
-              - undercloud-validate
+              remove_tags:
+                - build
             dependencies: *deps_cprovider
         - tripleo-ci-centos-8-standalone:
             vars: &sa_consumer_vars