Device component - OpenConfig driver:

- Add MTU to subinterfaces
- Cosmetic improvements

src/device/service/drivers/openconfig/templates/VPN/Network_instance_multivendor.py

@@ -204,7 +204,6 @@ def associate_If_to_NI(parameters, DEL):
                             with tag('id')          :text(parameters['id'])
                             with tag('interface')   :text(parameters['interface'])
                             with tag('subinterface'):text(parameters['subinterface'])
-
                             
     result = indent(
         doc.getvalue(),

src/device/service/drivers/openconfig/templates/interface/subinterface/edit_config.xml

@@ -33,7 +33,7 @@
                 {% if address_ip is defined %}
                 <oc-ip:ipv4>
                     <oc-ip:config>
-                        <oc-ip:mtu>1500</mtu>
+                        {% if mtu is defined %}<mtu>{{mtu}}</mtu>{% endif%}
                     </oc-ip:config>
                     <oc-ip:addresses>
                         <oc-ip:address>