Add the user_id into the volume information returned for getting the volume

[Vincent Hou]

Instances and images GET API will return the attribute user_id within the response, but volumes GET API does not return user_id.
A client of mine asked me if we can add this user_id into the volume information when we do a GET request, because they need to get the user immediately and decide further operations. I think user_id can bring more convenience.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/37167

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/37167
Committed: http://github.com/openstack/cinder/commit/c562ac705229710068c7f57fb87d2ab0f4fe54a0
Submitter: Jenkins
Branch: master

commit c562ac705229710068c7f57fb87d2ab0f4fe54a0
Author: Vincent Hou <email address hidden>
Date: Mon Jul 15 23:12:32 2013 -0400

    Add te field user_id into the volume detailed information.

    Fixed Bug 1200555.

    Change-Id: Ibc36453caa174432b69597b1b2a0b314a7730357