make DHT::add_known_node() private
make DHT::add_known_node() private

Signed-off-by: Thomas Stilwell <5828abb29abe27c7379b760761b50805c8b510cc@openlabs.co>

Renelvon/OpenBazaar,bglassy/OpenBazaar,akhavr/OpenBazaar,akhavr/OpenBazaar,STRML/OpenBazaar,matiasbastos/OpenBazaar,im0rtel/OpenBazaar,kordless/OpenBazaar,NolanZhao/OpenBazaar,yagoulas/OpenBazaar,atsuyim/OpenBazaar,tortxof/OpenBazaar,atsuyim/OpenBazaar,must-/OpenBazaar,matiasbastos/OpenBazaar,STRML/OpenBazaar,saltduck/OpenBazaar,bglassy/OpenBazaar,mirrax/OpenBazaar,habibmasuro/OpenBazaar,must-/OpenBazaar,freebazaar/FreeBazaar,mirrax/OpenBazaar,im0rtel/OpenBazaar,habibmasuro/OpenBazaar,dionyziz/OpenBazaar,bankonme/OpenBazaar,yagoulas/OpenBazaar,saltduck/OpenBazaar,blakejakopovic/OpenBazaar,freebazaar/FreeBazaar,kordless/OpenBazaar,saltduck/OpenBazaar,bankonme/OpenBazaar,Renelvon/OpenBazaar,blakejakopovic/OpenBazaar,must-/OpenBazaar,NolanZhao/OpenBazaar,tortxof/OpenBazaar,habibmasuro/OpenBazaar,im0rtel/OpenBazaar,tortxof/OpenBazaar,STRML/OpenBazaar,habibmasuro/OpenBazaar,mirrax/OpenBazaar,kordless/OpenBazaar,dionyziz/OpenBazaar,rllola/OpenBazaar,dionyziz/OpenBazaar,matiasbastos/OpenBazaar,bankonme/OpenBazaar,NolanZhao/OpenBazaar,atsuyim/OpenBazaar,bankonme/OpenBazaar,kordless/OpenBazaar,matiasbastos/OpenBazaar,STRML/OpenBazaar,mirrax/OpenBazaar,akhavr/OpenBazaar,akhavr/OpenBazaar,yagoulas/OpenBazaar,yagoulas/OpenBazaar,dionyziz/OpenBazaar,must-/OpenBazaar,tortxof/OpenBazaar,freebazaar/FreeBazaar,rllola/OpenBazaar,blakejakopovic/OpenBazaar,Renelvon/OpenBazaar,bglassy/OpenBazaar,atsuyim/OpenBazaar,akhavr/OpenBazaar,rllola/OpenBazaar,bglassy/OpenBazaar,freebazaar/FreeBazaar,dionyziz/OpenBazaar,blakejakopovic/OpenBazaar,Renelvon/OpenBazaar,im0rtel/OpenBazaar,rllola/OpenBazaar,freebazaar/FreeBazaar,saltduck/OpenBazaar,NolanZhao/OpenBazaar