Change dht-example to use the new API.
Change dht-example to use the new API.

jech/dht,loadletter/dht256,Librevault/dht,Erkan-Yilmaz/dht,gabrielfalcao/dht,mikedld/dht,tempbottle/dht-1,raspopov/dht,cfpp2p/dht