Drop lxml dependency, instead rely upon xml.etree package

[Jonathan LaCour]

Quantum currently depends on lxml, when it doesn't need to. We should change to just import xml.etree instead.

[Gary Kotton (garyk)]

Hi,
Can you please clarify why this needs to be done? I am not familiar with the differences.
Thanks
Gary

[dan wendlandt (danwent)]

Yeah, this makes sense. If the built-in python capability can do something, no need to use a third-party lib.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/15383

[yong sheng gong (gongysh)]

Does this mean we remove the _to_xml() method?
     def _to_xml(self, root):
 314 """Convert the xml object to an xml string."""
315 # we use lxml here instead of xml.minidom for performance reasons
316 return etree.tostring(root, encoding='UTF-8', xml_declaration=True)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/15383
Committed: http://github.com/openstack/quantum/commit/3df328144e9a15797ab0dd8c45cf713c32f86d31
Submitter: Jenkins
Branch: master

commit 3df328144e9a15797ab0dd8c45cf713c32f86d31
Author: Zhongyue Luo <email address hidden>
Date: Mon Nov 5 13:35:39 2012 +0800

    Drop lxml dependency

    Fixes bug #1068290

    Removed lxml from tools/pip-requires
    Removed usused method _to_xml() in quantum.wsgi.XMLDictSerializer

    Change-Id: I3410fd8645739abfd853f71efcbb354b58677b18