Allows the client to invoke any command supported by the specified node directly on our proxy instance.
Accepts no parameters.
Returns list of child node names.
gt; > a=as_node('services/time/local')
> > > a.children_names()
['hour', 'month', 'second', 'milliseconds', 'weekday', 'year', 'time_schedules_1', 'day', 'minute']