Add a oauth1-configuration.rst and extension section to docs

The patch addresses the following:
1) Add an extensions section to the configuration.rst
2) Add the oauth-configuration.rst to the previously mentioned
section.

fixes bug: #1218722

Change-Id: I0c832d89698fc43a19408e8e7c159f09e0ec5e15

doc/source/configuration.rst

@@ -652,6 +652,19 @@ files for each Server application.
 * ``etc/logging.conf.sample``
 * ``etc/default_catalog.templates``
 
+.. _`adding extensions`:
+
+Adding Extensions
+=================
+
+OAuth1.0a
+---------
+
+.. toctree::
+   :maxdepth: 1
+
+   extensions/oauth1-configuration.rst
+
 .. _`prepare your deployment`:
 
 Preparing your deployment

doc/source/extensions/oauth1-configuration.rst

@@ -0,0 +1,35 @@
+..
+      Copyright 2011-2013 OpenStack, Foundation
+      All Rights Reserved.
+
+      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.
+
+=============================
+Enabling the OAuth1 Extension
+=============================
+
+To enable the OAuth1 extension:
+
+1. Optionally, add the oauth1 extension driver to the ``[oauth1]`` section in ``keystone.conf``. For example::
+
+    [oauth1]
+    driver = keystone.contrib.oauth1.backends.sql.OAuth1
+
+2. Add the ``oauth1_extension`` filter to the ``api_v3`` pipeline in ``keystone-paste.ini``. For example::
+
+    [pipeline:api_v3]
+    pipeline = access_log sizelimit url_normalize token_auth admin_token_auth xml_body json_body ec2_extension s3_extension oauth1_extension service_v3
+
+3. Create the OAuth1 extension tables if using the provided SQL backend. For example::
+
+    ./bin/keystone-manage db_sync --extension oauth1