vyos.configdict: leaf_node_changed() must return empty dict when node is added
vyos.configdict: leaf_node_changed() must return empty dict when node is added

vyos@vyos# show interfaces pppoe
 pppoe pppoe10 {
+    access-concentrator asdfg
     authentication {
         password bar
         user foo
     }
     default-route force
     no-peer-dns
     source-interface eth0.202
 }

vyos@vyos# python3
Python 3.9.2 (default, Feb 28 2021, 17:03:44)
[GCC 10.2.1 20210110] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from vyos.config import Config
>>> from vyos.configdict import get_interface_dict
>>> from vyos.configdict import leaf_node_changed
>>> conf = Config()
>>> base = ['interfaces', 'pppoe']
>>> tmp = get_interface_dict(conf, base, 'pppoe10')
>>> leaf_node_changed(conf, ['access-concentrator'])
>>> ['']

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x