Comment 7 for bug 1301035

Reviewed: https://review.openstack.org/95509
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=48bc7db994dea4c296777c6ea9d65873c03567cd
Submitter: Jenkins
Branch: stable/icehouse

commit 48bc7db994dea4c296777c6ea9d65873c03567cd
Author: Carl Baldwin <email address hidden>
Date: Wed Apr 2 16:53:33 2014 +0000

    Replace loopingcall in notifier with a delayed send

    The loopingcall thread here was started before processes fork and so
    the thread stops working after the fork call. This is a problem that
    will probably need to be worked out in the long run.

    To ensure that this notifier works correctly in all processes, this
    change replaces the persistent loopingcall thread with a thread
    created on demand to delay and batch up notifications. The first
    notification will trigger spawning the thread to wait to send it. Any
    notifications that come in the meantime will notice that there is
    already a thread waiting to send and will return without spawning.

    Conflicts:
            neutron/notifiers/nova.py

    Change-Id: I519d4e89b8cee341c0e1cfffbce3e77151e8202a
    Closes-Bug: #1301035
    (cherry picked from commit 3be1d7a75c5ec754825e99e0a8d95b4e1521ae4b)