api/openstack/volume/test_snapshots.py is not testing volume api

[Vish Ishaya]

During one of the refactors, the snapshot tests were accidentally changed to test the compute extension instead of the new volume api.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/3877

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/3877
Committed: http://github.com/openstack/nova/commit/a3596658c83ed84970cfaba40d7f489728a00d48
Submitter: Jenkins
Branch: master

commit a3596658c83ed84970cfaba40d7f489728a00d48
Author: Vishvananda Ishaya <email address hidden>
Date: Tue Feb 7 16:56:04 2012 -0800

    Fixes volume snapshotting issues and tests

     * changes call for create_snapshot from contrib/volumes.py
     * fixes some raises in volume/snaphsots.py
     * rewrites volume api tests to use the right endpoint
     * updates contrib snapshots test to catch the error
     * fixes bug 928567
     * fixes bug 928588

    Change-Id: Ifa6bd8b70dc0df5c8811b0123072ba83eb170a45