Comment 2 for bug 1705351

Reviewed: https://review.openstack.org/485365
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=93d45fe1ab896c1ec9d183d9ab3c4248cf0aa5ea
Submitter: Jenkins
Branch: master

commit 93d45fe1ab896c1ec9d183d9ab3c4248cf0aa5ea
Author: Kevin Benton <email address hidden>
Date: Wed Jul 19 15:00:06 2017 -0700

    Ignore cast exceptions in AgentNotifierApi

    After an upgrade we can get NotFound exceptions from AMQP after there
    are no longer any agents interested in listening to that exchange.
    These should be ignored and not propagated up since they don't indicate
    any kind of issue.

    However, oslo messaging is not translating the exceptions into an
    oslo.messaging exception so there is no way to catch them without
    importing amqp directly.

    As a workround to unblock Ironic, this patch just proposes a generic
    catch of all exceptions during a cast. These casts occur after work
    has been done so raising them back to the user doesn't do anything
    useful anyway.

    Once we have an oslo.messaging exception to catch we can narrow it to
    that.

    Change-Id: I15cc2d6ae48e505c2da121880e27481dedf36d3b
    Partial-Bug: #1705351