Comment 26 for bug 1837252

Reviewed: https://review.opendev.org/678098
Committed: https://git.openstack.org/cgit/openstack/os-vif/commit/?id=ec9d5430300c908ea9a1c64151eee7af522a44e7
Submitter: Zuul
Branch: stable/stein

commit ec9d5430300c908ea9a1c64151eee7af522a44e7
Author: Sean Mooney <email address hidden>
Date: Thu Jul 25 22:16:42 2019 +0000

    only disable mac ageing for ovs hybrid plug

    The mac ageing configuration on linux bridges is now
    conditional and caller controlled. By default mac ageing
    is unspecified and will use the kernel's default of 300
    seconds. For ovs with hybrid plug we override this to
    0 to prevent packet loss issue during some migration
    edgecases. This change reverts disabling mac ageing
    for the linux bridge plugin which was accidentally
    introduced during the brctl removal via inheriting the
    ovs plugin's default behavior when the bridge create
    code became shared.

    Backport Changes:
      In the train cycle we removed the os_vif.internal.command
      module in Id8b71172fb06b435cf169a7e55c11233f22fa65b to eliminate
      one layer of indirection. As a result we need to addtionally
      update the add method in os_vif/internal/command/ip/__init__.py
      which was not required in the train patch.

    Change-Id: I95612352de6cdb47de98eb80c208dd1a74499d41
    Closes-bug: #1837252
    (cherry picked from commit 655c83d706f5de8a8cf23430782e065219297aef)