revoke driver default should be the non-deprecated driver

[Matt Fischer]

The revoke driver default in the sample config and in config.py is still using the deprecated driver, causing deprecation warnings and scary messages about removal to show up in log files.

2014-10-23 14:52:20.787 1236 WARNING keystone.openstack.common.versionutils [-] Deprecated: keystone.contrib.revoke.backends.kvs is deprecated as of Juno in favor of keystone.contrib.revoke.backends.sql and may be removed in Kilo.

class Revoke(revoke.Driver):

    @versionutils.deprecated(
        versionutils.deprecated.JUNO,
        in_favor_of='keystone.contrib.revoke.backends.sql',
        remove_in=+1,
        what='keystone.contrib.revoke.backends.kvs')

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/130917

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/130917
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=8bd0f6ecd882a3119acb5fd7a760122c8931db94
Submitter: Jenkins
Branch: master

commit 8bd0f6ecd882a3119acb5fd7a760122c8931db94
Author: wanghong <email address hidden>
Date: Sat Oct 25 10:26:55 2014 +0800

    default revoke driver should be the non-deprecated driver

    Have checked other config options that default is not the deprecated
    option, others are OK.

    Change-Id: Ie6e7351114d79eb25b392faaa0e6376c24c45fa0
    Closes-Bug: #1384775