Customize metadata bind host/port

This patch allows to customize metadata bind address/port
settings.

Change-Id: Ib238352e421d40f7fcbb969aceffa9f07b48ac2e
Related-Prod: PROD-17576
diff --git a/README.rst b/README.rst
index 828dd01..81c539d 100644
--- a/README.rst
+++ b/README.rst
@@ -424,6 +424,19 @@
         barbican:
           enabled: true
 
+Nova metadata custom bindings
+
+.. code-block:: yaml
+
+    nova:
+      controller:
+        enabled: true
+        ...
+        metadata:
+          bind:
+            address: 1.2.3.4
+            port: 8776
+
 
 Client role
 -----------