Comment 24 for bug 1445412

Reviewed: https://review.openstack.org/174818
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=a80924dc3e648984873833399350ba4817f1eaa9
Submitter: Jenkins
Branch: master

commit a80924dc3e648984873833399350ba4817f1eaa9
Author: Kevin Benton <email address hidden>
Date: Fri Apr 17 04:09:48 2015 -0700

    Don't update port with host id of None

    In the L3 RPC code if the host for a port is not
    present, it ends up calling update_port with the
    host_id set to None. This does not update the host
    id at all because it's treated as an unset attribute
    which leads to the same thing happening on the next
    iteration. These pointless update calls are expensive
    because they involve a semaphore and calls to mechanism
    drivers.

    This patch adjusts the logic to only send a port
    update if it actually has a host to ensure is on
    the port.

    Change-Id: Ic55496dd2ba3abcef0a2de9fc8699c391b79fa51
    Partial-Bug: #1445412