driver call to accept_transfer doesn't have enough info

[John Griffith]

The driver call portion of accept_transfer only includes the previous/pending owner and the volume-ref, this means that for backends that may need to do things like transfer accounts there's not enough information given to do so.

We need to either add the new user/project id info to the call or change things around in the reference update passed in to the drivers.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/42443

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/42443
Committed: http://github.com/openstack/cinder/commit/8fa1fa806b36bd9a06c13b0d1255e87c6307b179
Submitter: Jenkins
Branch: master

commit 8fa1fa806b36bd9a06c13b0d1255e87c6307b179
Author: John Griffith <email address hidden>
Date: Fri Aug 16 17:12:11 2013 -0600

    Added need info to accept_transfer

    Drivers that implement accept_transfer will need
    things like the new user_id and project_id. We were
    not including this in the original add, in order for
    drivers that are tenant aware this information will be
    necessary.

    Also the get_volume call in the transfer was using
    the new user context, so the volume would never be
    found. We fix this here by providing an elevated
    context to the get_volume call when accepting the
    transfer.

    Change-Id: I7b60c19950f85c4309a97bb842ff238bcf8e746a
    Fixes: bug 1213275