Add centos-9 jobs for wallaby zuul layout

This adds the tripleo-ci-centos-9-standalone-tv-validation for
the wallaby layout. See [1] for related reviews - wallaby will
run both 8 and 9 jobs.

[1] https://review.opendev.org/q/topic:c9_wallaby_gates
Depends-On: https://review.opendev.org/c/openstack/tripleo-ci/+/830132
Change-Id: I8ca835f6c99fd9375c8e3bea6b1e607955b079b9

zuul.d/base.yaml

@@ -17,8 +17,13 @@
 - job:
     name: tripleo-ci-centos-8-standalone-tv-validation
     parent: tripleo-ci-centos-8-standalone
-    vars:
+    vars: &standalone_validation_vars
       featureset: '052'
       validate_services: true
       enable_validation: true
       validation_component: validation
+
+- job:
+    name: tripleo-ci-centos-9-standalone-tv-validation
+    parent: tripleo-ci-centos-9-standalone
+    vars: *standalone_validation_vars

zuul.d/layout.yaml

@@ -14,7 +14,7 @@
               - ^molecule-requirements.txt
               - ^requirements.txt
               - ^README.rst
-        - tripleo-ci-centos-8-content-provider:
+        - tripleo-ci-centos-8-content-provider: &content_provider_deps
             dependencies:
               - openstack-tox-linters
         - tripleo-ci-centos-8-standalone-tv-validation:
@@ -25,6 +25,11 @@
                 - build
             dependencies:
               - tripleo-ci-centos-8-content-provider
+        - tripleo-ci-centos-9-content-provider: *content_provider_deps
+        - tripleo-ci-centos-9-standalone-tv-validation: &9_tv_validation_all
+            vars: *consumer_vars
+            dependencies:
+              - tripleo-ci-centos-9-content-provider
         - openstack-tox-py36
     gate:
       jobs:
@@ -35,6 +40,8 @@
             vars: *consumer_vars
             dependencies:
               - tripleo-ci-centos-8-content-provider
+        - tripleo-ci-centos-9-content-provider: *content_provider_deps
+        - tripleo-ci-centos-9-standalone-tv-validation: *9_tv_validation_all
         - openstack-tox-py36
 
     promote: