Add ansible hieradata file

Wire up ansible_managed hieradata and provide a default file.

NOTE: In stable/train the name of the role is tripleo-hieradata and not
tripleo_hieradata

Depends-On: https://review.opendev.org/#/c/723628/
Change-Id: If3226be3ac6b2596a13985fe226f23afc3458907
(cherry picked from commit 4407c54f6b)

common/hiera-steps-tasks.yaml

@@ -28,3 +28,7 @@
       - service_configs
       - extraconfig
       - role_extraconfig
+- name: Ensure ansible_managed hieradata file exists
+  include_role:
+    name: tripleo-hieradata
+    tasks_from: ansible_hieradata.yml

overcloud.j2.yaml

@@ -593,6 +593,7 @@ resources:
           - '"%{::uuid}"'
           - fqdn
           - docker_puppet # Optionally provided by container-puppet.py
+          - ansible_managed
           - heat_config_%{::deploy_config_name}
           - config_step
           - role_extraconfig