change an assert to a warn until I can fix a fast retransmit bug
change an assert to a warn until I can fix a fast retransmit bug

sit/dht,sit/dht,weidezhang/dht,weidezhang/dht,weidezhang/dht,weidezhang/dht,sit/dht,sit/dht,sit/dht,weidezhang/dht