Comment 2 for bug 1998108

Reviewed: https://review.opendev.org/c/openstack/neutron/+/865857
Committed: https://opendev.org/openstack/neutron/commit/49eab7d308b598e4c4966110d6aa61cd091cc3f6
Submitter: "Zuul (22348)"
Branch: master

commit 49eab7d308b598e4c4966110d6aa61cd091cc3f6
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Thu Nov 17 21:14:40 2022 +0100

    Move registration "ChassisBandwidthConfigEvent" to OvnSbIdl init

    The "ChassisBandwidthConfigEvent" event registration is now done in the
    "OvnSbIdl" class initialization. That ensures this event is registered
    in a worker thread.

    If the event is called before the "OVNMechanismDriver"'s "OVNClient"
    has been instantiated, the event is skipped. When the OVN placement
    extension is loaded, all chassis configurations are read and loaded,
    thus any previous event is not relevant.

    This patch also adds a "match_fn" check to
    "ChassisBandwidthConfigEvent". If during an update event, the bandwidth
    options are not modified, this class does not update the resource
    provider inventories.

    Closes-Bug: #1998108
    Related-Bug: #1578989
    Change-Id: I74883041c642b9498299ebf2b5bf885776e241e0