Comment 4 for bug 1823760

Reviewed: https://review.opendev.org/675103
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=2cd9e44e66dbf83ce763cbe2d7bca1593b1bd891
Submitter: Zuul
Branch: master

commit 2cd9e44e66dbf83ce763cbe2d7bca1593b1bd891
Author: Martin Schuppert <email address hidden>
Date: Thu Aug 1 10:17:03 2019 +0200

    Add NovaLocalMetadataPerCell cell support

    Indicates that the nova-metadata API service has been deployed
    per-cell, so that we can have better performance and data isolation
    in a multi-cell deployment. Users should consider the use of this
    configuration depending on how neutron is setup. If networks span
    cells, you might need to run nova-metadata API service globally.
    If your networks are segmented along cell boundaries, then you can
    run nova-metadata API service per cell.

    Introduces a new endpoint_map entry NovaMetadataInternal.

    If NovaLocalMetadataPerCell is true, NovaMetadataCellInternal points
    to the local cell endpoint.

    If NovaLocalMetadataPerCell is false, NovaMetadataCellInternal points
    to the central control plane nova metadata endpoint.

    The NovaMetadataCellInternal endpoint is then used to configure the
    nova-metadata api endpoint the ovn metadata agent points to.

    Also removes setting the deprecated [DEFAULT]/nova_metadata_ip
    hiera key and only uses [DEFAULT]/nova_metadata_host for the ovn
    metadata agent.

    Depends-On: https://review.opendev.org/675070
    Depends-On: https://review.opendev.org/650943
    Change-Id: I78f6d30676ee166f84d8aca1609b376bb73e5f2c
    Closes-Bug: #1823760

    Change-Id: I1e05230e4105a3706f0662b0c203137d05ebf3d8