Comment 13 for bug 1736674

Reviewed: https://review.openstack.org/527965
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=cbee0f9f88ff34f70ff19590471b5405e06ff2a9
Submitter: Zuul
Branch: master

commit cbee0f9f88ff34f70ff19590471b5405e06ff2a9
Author: Sławek Kapłoński <email address hidden>
Date: Thu Dec 14 14:51:01 2017 +0100

    Use same instance of iptables_manager in L2 agent and extensions

    This commit adds common_agent_extension class which is agent API
    for L2 extension drivers used e.g. by Linuxbridge agent.
    This is necessary to be able to use instance of iptables_manager
    used in firewall driver also in L2 extension drivers (like qos).

    This patch refactors little bit iptables_manager code to make possible
    to initialize e.g. mangle or nat table on demand, even if iptables
    is created as "state_less"

    Change-Id: I3b66e49b7f176124e8aea3eb96d0d465f1ab1ea0
    Closes-Bug: #1736674