lack "capabilities:" prefix when set volume_backend_name in test_multi_backend

[Jerry Cai]

In tempest/api/volume/admin/test_multi_backend.py:
Multiple backend cases set volume_backend_name into extra_specs, but need to set "capabilities:volume_backend_name" rather than "volume_backend_name", as cinder-scheduler uses all the "capabilities:" to scope the cinder-volume. With no "capabilities:" prefix in extra_spec, it will be no effect from cinder-scheduler.

Need to add "capabilities:" prefix.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/81842

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/81842
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=6e5eed243400a2391bdea2abca2751f0c2d0bac7
Submitter: Jenkins
Branch: master

commit 6e5eed243400a2391bdea2abca2751f0c2d0bac7
Author: Jerry Cai <email address hidden>
Date: Thu May 8 20:48:08 2014 +0800

    Add "capabilities:" to multiple_backends extra-spec key

    cinder-scheduler uses all the "capabilities:" to scope the
    cinder-volume. With no "capabilities:" prefix set in extra_spec,
    it will be no effect from cinder-scheduler to schedule the
    cinder-volume, which is not the purpose of the testcase.
    To address the review comment, This change will not remove but
    adds 2 cases for the "capabilities:" prefix to volume type key:
    extra-spec "capabilities:volume_backend_name".

    Change-Id: Ie870091f2a5657b3ab6a0171de2cffe6945a0f7c
    Closes-Bug: #1295050