Need elevated context when accepting transfer

[John Griffith]

The transfer_accept method in transfer/api.py is trying to access the volume reservations from the donor before the ownership has been transferred. In other words, we call accept as the "new" owner and try to adjust quotas for the "old" owners quotas upon transfer.

Simply fix by elevating the context on the quota reservation update call.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/31690

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/31690
Committed: http://github.com/openstack/cinder/commit/e02cf9c373daa7b03e141e016fb166841f6b02b7
Submitter: Jenkins
Branch: master

commit e02cf9c373daa7b03e141e016fb166841f6b02b7
Author: John Griffith <email address hidden>
Date: Tue Jun 4 12:59:20 2013 -0600

    Elevate acceptors context on accept reserve udpate

    When accepting a transfer we need to update the
    quota data for both the donor and the acceptor's.
    The acceptor is easy enough (as that's the context
    we currently are using) however to update the donor's
    quota data we need an elevated context.

    Fixes bug: 1187538

    Change-Id: I1fb9e7726830dce2c3de23d3446de5bbe9a1fd24