Rad conf option

[Stephane Guedon]

Hello

I think the "nameserver" option of rad (router advertisement daemon) should be 
able to support a keyword like "self" to refer the router itself as a 
nameserver also, similar to the "self" keyword in PF.

This could be a reference in the global configuration and/or specific 
interfaces 
conf'.

I think this could be beneficial in term of conf' simplicity and avoiding 
mistakes (especially if the router has to deal with frequent renumbering).

example :

Currently:

interface re0
        dns {
                nameserver 2a06:a4:7d:20::1 2600::1
                }

interface re1
      dns {
             nameserver 2a06:a4:7d:30::1
             }

-----------

wish:

dns { 
       nameserver self
        }

interface re0
interface re1

Regards, Stéphane