remove KVS backend for keystone.contrib.revoke

when the revoke extension was moved out to the top level, a
reference to already deprecated KVS backend was kept.

the reference in contrib was also deprecated, but since we're
removing the one it points to, there is no need to keep it
around.

bp removed-as-of-mitaka
Change-Id: Ib917b2daff70bd942a8f9786998ca0ed743c28d3

keystone/contrib/revoke/backends/kvs.py

@@ -1,29 +0,0 @@
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-
-from oslo_log import versionutils
-
-from keystone.revoke.backends import kvs
-
-
-_OLD = 'keystone.contrib.revoke.backends.kvs.Revoke'
-_NEW = 'kvs'
-
-
-class Revoke(kvs.Revoke):
-
-    @versionutils.deprecated(versionutils.deprecated.MITAKA,
-                             in_favor_of=_NEW,
-                             remove_in=2,
-                             what=_OLD)
-    def __init__(self, *args, **kwargs):
-        super(Revoke, self).__init__(*args, **kwargs)