Add Barbican integration

This patch adds Barbican integration to Glance

Change-Id: I879f183ca5f6e7713ebbc5f5fb71702a0219a1d6
Related-PROD: PROD-15205
diff --git a/README.rst b/README.rst
index af03680..02da35d 100644
--- a/README.rst
+++ b/README.rst
@@ -56,6 +56,8 @@
           enabled: false
         api_limit_max: 100
         limit_param_default: 50
+        barbican:
+          enabled: true
 
 The pagination is controlled by the *api_limit_max* and *limit_param_default*
 parameters as shown above:
@@ -285,6 +287,17 @@
 benefit from rbd enhancements.
 
 
+Barbican integration glance
+---------------------------
+
+.. code-block:: yaml
+
+    glance:
+      server:
+          barbican:
+            enabled: true
+
+
 Client role
 -----------