Comment 10 for bug 1896735

Reviewed: https://review.opendev.org/756107
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=2325ad1950412d3eef0cde848c56bb94fbbb7495
Submitter: Zuul
Branch: master

commit 2325ad1950412d3eef0cde848c56bb94fbbb7495
Author: Slawek Kaplonski <email address hidden>
Date: Mon Oct 5 17:07:43 2020 +0200

    Add locks for methods which sets nat rules in router

    Router_info class and port_forwarding L3 extensions are using same
    instance of the iptables manager class and it could happend that
    method which sets address scope rules and method which sets
    port forwarding nat rules where run in almost same time and
    one of them was adding rules which wasn't expected to be added.
    Because of that port forwarding rules wasn't configured properly.

    This patch fixed that by adding lock for methods which are changing
    rules in iptables_manager's nat table in both router_info and
    port_forwarding extension.

    Change-Id: Ic1d5f893a81b7b841745da82f38b7583e47e468d
    Closes-Bug: #1896735