fix nasty stabilize screwup bugfix that just made it all worse.  don't iterate through _nodes while stabilizing because it may disappear right under our feet. duh.
fix nasty stabilize screwup bugfix that just made it all worse.  don't iterate through _nodes while stabilizing because it may disappear right under our feet. duh.

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