restructure link pruning in path finder (and fix an off-by-1 error)
restructure link pruning in path finder (and fix an off-by-1 error)

jeroenh/OpenNSA,jeroenh/OpenNSA,jab1982/opennsa,jab1982/opennsa,NORDUnet/opennsa,NORDUnet/opennsa,jeroenh/OpenNSA,NORDUnet/opennsa