Comment 7 for bug 1882643

Reviewed: https://review.opendev.org/736591
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=1851d881261bc07f0f40179e427fd5f0e9c5a0ab
Submitter: Zuul
Branch: stable/train

commit 1851d881261bc07f0f40179e427fd5f0e9c5a0ab
Author: Xing Zhang <email address hidden>
Date: Tue May 12 19:07:30 2020 +0800

    Make octavia service_auth project configurable

    (Renamed and adapted from Switch octavia to use service project in
     service_auth on master and stable/ussuri)

    Recently a patch [1] was merged to stop adding the octavia user to the
    admin project, and remove it on upgrade. However, the octavia
    configuration was not updated to use the service project, causing load
    balancer creation to fail.

    There is also an issue for existing deployments in simply switching to
    the service project. While existing load balancers appear to continue to
    work, creating new load balancers fails due to the security group
    belonging to the admin project. At a minimum, the deployer needs to
    create a security group in the service project, and update
    'octavia_amp_secgroup_list' to match its ID. Ideally the flavor and
    network would also be recreated in the service project, although this
    does not seem to impact operation and will result in downtime for
    existing Amphorae.

    This change adds a new variable, 'octavia_service_auth_project', that
    can be used to set the project. The default in Ussuri is 'service',
    switching to the new behaviour. For backports of this patch to Train and
    earlier branches it should be switched to 'admin' to maintain
    compatibility.

    In Train and earlier, if a deployer keeps the default
    'octavia_service_auth_project' of 'admin', the octavia user will be
    assigned the admin role in the admin project, as was done previously.
    They may also set 'octavia_service_auth_project' to 'service' to use the
    new behaviour, and avoid a breaking change when later upgrading to
    Ussuri.

    Closes-Bug: #1882643
    Related-Bug: #1873176

    [1] https://review.opendev.org/720243/

    Co-Authored-By: Mark Goddard <email address hidden>

    Change-Id: I1efd0154ebaee69373ae5bccd391ee9c68d09b30
    (cherry picked from commit c2037885e756b4d42b38e1ce1852a50d2ffbc764)