Extend interfaces file of ovs bridge/port

* bridge: name servers list
* port: native vlan tagged ports

Change-Id: Ie9c318c37ac4f13b04f7650c70824dfe4198405a
Related-Bug: PROD-24343
diff --git a/README.rst b/README.rst
index 9655d5e..dad1aaa 100644
--- a/README.rst
+++ b/README.rst
@@ -1887,6 +1887,12 @@
           br-prv:
             enabled: true
             type: dpdk_ovs_bridge
+          br-floating:
+            enabled: true
+            type: ovs_bridge
+            name_servers:
+              - 1.1.1.1
+              - 9.9.9.9
 
 **DPDK OVS Bond**