Fix bug that could cause loops in initializing skip pointers for new entries that increase the level of the tree.
Fix bug that could cause loops in initializing skip pointers for new
entries that increase the level of the tree.

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