make keystone authentication variable

Change-Id: I553e0b64b17a863f90fdd72d6a53ac5757757003
diff --git a/README.rst b/README.rst
index 155f957..017b3a9 100644
--- a/README.rst
+++ b/README.rst
@@ -533,8 +533,6 @@
           dns: 127.0.0.1
           mtu: 9000
 
-
-
 Keystone v3
 -------------
 
@@ -562,6 +560,34 @@
           version: '3'
         ...
 
+Without Keystone
+----------------
+
+.. code-block:: yaml
+
+    opencontrail:
+      ...
+      common:
+        ...
+        identity:
+          engine: none
+          token: none
+          password: none
+        ...
+      config:
+        ...
+        identity:
+          engine: none
+          password: none
+          token: none
+        ...
+      web:
+        ...
+        identity:
+          engine: none
+          password: none
+          token: none
+        ...
 Usage
 =====