Add update queue function in v2

[OpenStack Infra]

https://review.openstack.org/294368
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commit 2854847fb473238fdc622aa8e7f103710c0dc6e1
Author: wangxiyuan <email address hidden>
Date: Fri Mar 18 10:37:32 2016 +0800

    Add update queue function in v2

    This patch did:
    1. Add two commands: "set/get metadata" in API v2.
    2. As v1.1 and v2 don't contain the queue.exist() function,
    and the queue exist check has been done in server side. We
    should only use it in v1.0.
    3. As v1.1 doesn't support PATCH in zaqar server side,
    we should not allow set metadata in v1.1.

    DocImpact

    Closes-bug: #1554326
    Change-Id: I01b523ece09e87689516ecccf0c2c7795db46bb7

[wangxiyuan (wangxiyuan)]

related doc has been added already.