Enable DNS servers with OVS port intefaces

The template for ovs_port in linux formula do not
have nameservers option so the server become without
any nameservers configuration.

Add parameter for name servers to ovs_port type
interface template.

PROD-31606

Change-Id: If44c7ca3f12069ecd5f68069ce89fa9eb3ee42b9
(cherry picked from commit 52f9f7631f93faacfd1c39b7c5d8b93990f6beb3)
diff --git a/README.rst b/README.rst
index 0643d8e..1230b5b 100644
--- a/README.rst
+++ b/README.rst
@@ -1686,6 +1686,28 @@
             type: ovs_port
             ovs_bridge: br-ens7
             bridge: br-ens7
+          ens6:
+            enabled: true
+            proto: manual
+            type: eth
+            ovs_bridge: br-ctl
+          br-ctl:
+            enabled: true
+            type: ovs_bridge
+          internal-br-ctl-port:
+            enabled: true
+            proto: static
+            address: 172.172.0.10
+            netmask: 255.255.0.0
+            name_servers:
+            - 8.8.8.8
+            - 172.172.172.172
+            name: port-br-ctl
+            bridge: br-ctl
+            ovs_type: ovs_port
+            type: ovs_port
+            port_type: internal
+            mtu: 65000
 
 Debian manual proto interfaces