Extend OpenContrail salt-formula by disable_vnc_api_stats option

Add support of disable_vnc_api_stats configuration option for
config-api service to disable/enable sending statistics to collector
service

Related-PROD: PROD-35795
Change-Id: I81e6f10d3480ac6a2d2799ad9cc0ea4794ccba4b
diff --git a/README.rst b/README.rst
index 4ab05bb..d4d2507 100644
--- a/README.rst
+++ b/README.rst
@@ -1633,6 +1633,21 @@
         disable_stats_collection: True
         ....
 
+Disable sending VncApi stats to collector
+---------------------------------------------
+On every http resource request(create/update/list/etc...) config-api server throws
+statistics to collector. This option can be used to reduce amount of these messages
+to collector service.
+
+.. code-block:: yaml
+
+    opencontrail:
+      ....
+      config
+        ....
+        disable_vnc_api_stats: True
+        ....
+
 Usage
 =====