Remove token_endpoint auth type

The token_endpoint was a compatibility auth type to maintain support
for the --url global option that dated back to the beginning of
OpenStack CLI auth.  The common keystoneauth library implements
'admin_token' which provides the same functionality using
--endpoint rather than --url.

Change-Id: I1b9fbb96e447889a41b705324725a2ffc8ecfd9f
Signed-off-by: Dean Troyer <dtroyer@gmail.com>

openstackclient/api/auth_plugin.py

@@ -1,61 +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.
-#
-
-"""Authentication Plugin Library"""
-
-from keystoneauth1 import loading
-from keystoneauth1 import token_endpoint
-
-from openstackclient.i18n import _
-
-
-class TokenEndpoint(loading.BaseLoader):
-    """Auth plugin to handle traditional token/endpoint usage
-
-    Keystoneauth contains a Token plugin class that now correctly
-    handles the token/endpoint auth compatible with OSC.  However,
-    the AdminToken loader deprecates the 'url' argument, which breaks
-    OSC compatibility, so make one that works.
-    """
-
-    @property
-    def plugin_class(self):
-        return token_endpoint.Token
-
-    def load_from_options(self, url, token, **kwargs):
-        """A plugin for static authentication with an existing token
-
-        :param string url: Service endpoint
-        :param string token: Existing token
-        """
-
-        return super(TokenEndpoint, self).load_from_options(
-            endpoint=url,
-            token=token,
-        )
-
-    def get_options(self):
-        """Return the legacy options"""
-
-        options = [
-            loading.Opt(
-                'url',
-                help=_('Specific service endpoint to use'),
-            ),
-            loading.Opt(
-                'token',
-                secret=True,
-                help=_('Authentication token to use'),
-            ),
-        ]
-        return options