Support a new qpid topology

[OpenStack Infra]

https://review.openstack.org/56686
commit 7e1fddb2171f4ce3ccceb507eea2ee413e81c66d
Author: Russell Bryant <email address hidden>
Date: Wed Aug 28 12:09:54 2013 -0400

    Support a new qpid topology

    There has been a bug open for a while pointing out that the way we
    create direct exchanges with qpid results in leaking exchanges since
    qpid doesn't support auto-deleting exchanges. This was somewhat
    mitigated by change to use a single reply queue. This meant we created
    far fewer direct exchanges, but the problem persists anyway.

    A Qpid expert, William Henry, originally proposed a change to address
    this issue. Unfortunately, it wasn't backwards compatible with existing
    installations. This patch takes the same approach, but makes it
    optional and off by default. This will allow a migration period.

    As a really nice side effect, the Qpid experts have told us that this
    change will also allow us to use Qpid broker federation to provide HA.

    DocImpact
    Closes-bug: #1178375
    Co-authored-by: William Henry <email address hidden>
    Change-Id: I09b8317c0d8a298237beeb3105f2b90cb13933d8

[Stephen Gordon (sgordon)]

So from an openstack-manuals point of view I think the correct place for us to make this change is the HA guide. In the basic install guide architecture we only install one message broker and I don't think this changes anything significant for that case.

[Tom Fifield (fifieldt)]

Agree with Stephen.

I've checked and the new config option is in the config reference. I also added a release note to https://wiki.openstack.org/wiki/ReleaseNotes/Icehouse#General_Upgrade_Notes

Since there's existing bugs that address the HA guide's need for an update as a whole, I'm going to close this as fix released.