Drop deprecated neutronclient.i18n wrapper

In favor of the private i18n wrapper (_i18n), the public 'i18n' wrapper
has been deprecated for several releases. Each neutron CLI plugin
(not OSC plugin) should use its own i18n wrapper and the usage of
neutronclient.i18n wrapper was deprecated. It is time to drop this.

Also fixes test_exception.py which still consumed neutronclient.i18n.

Change-Id: I27a8ace2f31bea5e1d6bf8a5ebbbfa52a3228e73

neutronclient/i18n.py

@@ -1,23 +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.
-
-# TODO(amotoki): Remove this file at the beginning of Nxx cycle.
-
-from debtcollector import moves
-
-from neutronclient import _i18n
-
-message = ("moved to neutronclient._i18n; please migrate to local "
-           "oslo_i18n usage, as defined at "
-           "http://docs.openstack.org/developer/oslo.i18n/usage.html")
-
-_ = moves.moved_function(_i18n._, '_', __name__, message=message)

neutronclient/tests/unit/test_exceptions.py

@@ -17,8 +17,8 @@ from oslo_utils import encodeutils
 import six
 import testtools
 
+from neutronclient._i18n import _
 from neutronclient.common import exceptions
-from neutronclient.i18n import _
 
 
 class TestExceptions(testtools.TestCase):