Comment 8 for bug 1903210

Reviewed: https://review.opendev.org/762153
Committed: https://opendev.org/openstack/charm-nova-compute/commit/7a178053f1cb915f3fe50f328c7a2cf90c03f565
Submitter: Zuul
Branch: stable/20.10

commit 7a178053f1cb915f3fe50f328c7a2cf90c03f565
Author: Rodrigo Barbieri <email address hidden>
Date: Thu Nov 5 18:32:10 2020 -0300

    Add/update region config in nova.conf

    On multi-region deployments, Nova may talk to the wrong
    neutron endpoint (from the wrong region) if the region
    is unspecified.

    On Rocky+ it will also require updating the
    os_region_name config to region_name, as os_region_name
    has been deprecated, otherwise Nova will talk to the wrong
    placement endpoint as well.

    This fix addresses the issue where nova-compute will not
    register the node to the correct nova_api/placement
    database, and will also not be able to complete live-migrations.

    Given that the template for the [placement] section is
    applied to every release, it is included both old and
    new config options.

    Change-Id: I9500ba400d55e6f1bc11f2ba05b25b4714cda578
    Closes-bug: #1903210
    (cherry picked from commit 835d4b167ab7db41962239eaabb56f492fa34cde)