Drop XML support in Magnum

[hongbin]

TC recommended to deprecate XML support [1], so Magnum should drop XML support. Note that Magnum code base was ported from Ironic and Ironic has already dropped XML support [2] [3]. So, Magnum could just cherry-pick the commit from Ironic.

[1] http://lists.openstack.org/pipermail/openstack-tc/2014-January/000494.html
[2] https://bugs.launchpad.net/ironic/+bug/1271317
[3] https://review.openstack.org/#/c/169643/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/200961

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/200961
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=77397eecc65136e16b6501986ee9171d46bfe84f
Submitter: Jenkins
Branch: master

commit 77397eecc65136e16b6501986ee9171d46bfe84f
Author: Michael Sambol <email address hidden>
Date: Sun Jul 12 19:43:30 2015 -0500

    Drop XML support in Magnum

    This patch disables XML from the Magnum API. It's modeled after
    a simliar Ironic patch found here:
    https://review.openstack.org/#/c/169643/8.

    To disable XML, we wrap wsmeext.pecan.expose() and replace all the
    decorators with a call to magnum.api.expose.expose().

    Change-Id: I53ee0ac4fa4a5d899d40cb87213e48ae84ec4970
    Closes-bug: 1471507