Comment 5 for bug 1839546

Reviewed: https://review.opendev.org/678247
Committed: https://git.openstack.org/cgit/openstack/tripleo-ansible/commit/?id=7137cae523c57638eefb5a1f7b5ea73ecd38c573
Submitter: Zuul
Branch: master

commit 7137cae523c57638eefb5a1f7b5ea73ecd38c573
Author: James Slagle <email address hidden>
Date: Fri Aug 23 10:43:58 2019 -0400

    Restore AllNodesExtraMapData

    This commit is the same as I890bbef764b6bae7cb71cfedaff2ce17829737fb, which was
    previously applied to tripleo-common, but lost in the migration to
    tripleo-ansible.

    Commit a7661065743086961b8ef93056b810e7d2a49eda removed the
    all-nodes-config.j2.yaml Heat template. This template had the support
    for specifying hieradata to merge into the all_nodes hieradata via the
    AllNodesExtraMapData.

    This commit restores the merge logic so that the merged hieradata from
    the parameter value and the calculated hieradata is rendered in
    all_nodes.json.

    Change-Id: I49948f8d74c3846321af4f423a4891a71d0fabdc
    Closes-Bug: #1839546