NFD

The current self-learning forwarding strategy uses the default Strategy::afterContentStoreHit trigger when an Interest can be satisfied by the CS, which simply sends the Data back. However, it is possible that the Data in CS does not carry a Prefix Announcement, but the Interest is a discovery Interest. Therefore, this task is to add actions in SelfLearningStrategy::afterContentStoreHitto handle this case. In particular,

• Self-learning needs to check if the incoming Interest is "discovery", and if the returned Data carries a Prefix Announcement
• If the above checks indicate that a Prefix Announcement is needed, SelfLearningStrategy::asyncProcessData is invoked.