Handle Token/Endpoint authentication

This is essentially the Admin token where your authentication will
always use a given token and have no means of querying information from
within that token blob.

Change-Id: Ia4317836d6fc1e62c65a1dcbd84c820d90832dc4

keystoneclient/auth/token_endpoint.py

@@ -0,0 +1,31 @@
+# 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 keystoneclient.auth import base
+
+
+class Token(base.BaseAuthPlugin):
+    """A provider that will always use the given token and endpoint.
+
+    This is really only useful for testing and in certain CLI cases where you
+    have a known endpoint and admin token that you want to use.
+    """
+
+    def __init__(self, endpoint, token):
+        # NOTE(jamielennox): endpoint is reserved for when plugins
+        # can be used to provide that information
+        self.endpoint = endpoint
+        self.token = token
+
+    def get_token(self, session):
+        return self.token