Adding virtualport interface attribute for nic

Prod-Related: PROD-20747

Change-Id: Id7822963ab45ff7db3252f5329a9376aa4bf10d6
diff --git a/README.rst b/README.rst
index 6263e43..8b7d6ef 100644
--- a/README.rst
+++ b/README.rst
@@ -404,6 +404,11 @@
         - name: nic04
           bridge: br-public
           model: virtio
+        - name: nic05
+          bridge: br-prv
+          model: virtio
+          virtualport:
+            type: openvswitch
 
 
     salt: