Comment 9 for bug 1750777

Reviewed: https://review.openstack.org/548976
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=4c8b97eca32c9c2beadf95fef14ed5b7d8981c5a
Submitter: Zuul
Branch: master

commit 4c8b97eca32c9c2beadf95fef14ed5b7d8981c5a
Author: Brian Haley <email address hidden>
Date: Thu Mar 1 15:42:59 2018 +0000

    Do not start conntrack worker thread from __init__

    Instead, start it when the first entry is being added to
    the queue. Also, log any exceptions just in case get()
    throws something so we can do further debugging.

    Changed class from Queue to LightQueue was done after going
    through the eventlet.queue code looking at usage, since
    it's a little smaller and should be faster.

    Change-Id: Ie84be88382f327ebe312bf17ec2dc5c80a8de35f
    Closes-bug: 1750777