Add a basic framework to create DataTreeChangeListeners
Add a basic framework to create DataTreeChangeListeners.
Change-Id: Iaf9ddea9bf312ba7659a57f1d63d5d93fa949938 Signed-off-by: David Suarez <david.suarez.fuentes@ericsson.com> Signed-off-by: David Suarez <david.suarez.fuentes@gmail.com>