Ability to allow a user to change their own password

Fix proposed to branch: master
Review: https://review.openstack.org/7437

This is fairly important and has been an outstanding bug for a long time. Can we make a real effort to ensure this is in folsom assuming the V3 API has the support we need and is ready in time?

Reviewed: https://review.openstack.org/7437
Committed: http://github.com/openstack/keystone/commit/4ab47ad224c422dcd96aa256740945d1e6a8a208
Submitter: Jenkins
Branch: master

commit 4ab47ad224c422dcd96aa256740945d1e6a8a208
Author: Derek Higgins <email address hidden>
Date: Thu Jul 5 22:15:48 2012 +0100

    Adding user password setting api call

    Fixes bug 996922

    This commit adds a user_crud module that can be used in the public wsgi
    pipeline, currently the only operation included allows a user to update
    their own password.

    In order to change their password a user should make a HTTP PATCH to
    /v2.0/OS-KSCRUD/users/<userid>
    with the json data fomated like this
    {"user": {"password": "DCBA", "original_password": "ABCD"}}

    in addition to changing the users password, all current tokens
    will be cleared (for token backends that support listing) and
    a new token id will be returned.

    Change-Id: I0cbdafbb29a5b6531ad192f240efb9379f0efd2d