* [x] Remove boilerplate code from PPPoE server implementation
* [x] Remove IPv4/IPv6 name-server nodes from CLI and migrate to common `name-server` node
* [x] Cleanup wins-server CLI nodes and remove superfluous server-1/server-2 nodes
* [x] Migrate RADIUS config to common include
* [ ] Migrate IPv6 prefixes to proper CLI with embeded validators