Comment 4 for bug 1454921

Reviewed: https://review.openstack.org/272025
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=7b5ba5b35a2c793a21a1f2d336cc339e37eeee2f
Submitter: Jenkins
Branch: master

commit 7b5ba5b35a2c793a21a1f2d336cc339e37eeee2f
Author: Hong Hui Xiao <email address hidden>
Date: Mon Jan 25 06:20:49 2016 -0500

    Log warning message if get_subnet_for_dvr fails

    When subnet or gateway port has been deleted concurrently, rpc call
    to get_subnet_for_dvr will return an empty dict without any value.
    ovs_dvr_neutron_agent should be more gracefull and at least log
    warning message in that situation.

    Change the existing error log to warning, because it is not a server
    error, but a fact that should be noticed.

    Change-Id: Icb3a57553a8b0eb635c0d85e2c60e7ce519893f6
    Closes-bug: #1454921