Comment 2 for bug 1257198

Reviewed: https://review.openstack.org/59648
Committed: http://github.com/openstack/cinder/commit/3b2842bf2df46daf4e4d26695c06963499968181
Submitter: Jenkins
Branch: master

commit 3b2842bf2df46daf4e4d26695c06963499968181
Author: ling-yun <email address hidden>
Date: Tue Dec 3 16:19:17 2013 +0800

    All API controllers inherit from wsgi.Controller

    Most of the Cinder Public API Controllers inherit from wsgi.Controller,
    but still some Cinder Public APIs controllers directly inherit from
    object. So it's necessary to unify all the Cinder Public API Controllers
    inherit from wsgi.Controller.
    1. For code cleanup.
    2. When we try to do body valid check in api's put/post method later, we
    can use the helper function is_valid_body instead of using try...catch
    block.

    Change-Id: I88812224e0b182939cfccce63982cb8f95792891
    Closes-Bug: #1257198