[chord] Trace to the lookup process

[Hai Dao Le]

Hi,

Please let me know how to trace to the lookup process (in recursive
mode). I guess when a node wants to do a lookup, it first uses
recroute<T>::dorecroute. If the key is not found, the node then forwards
to another by recroute<T>::dorecroute_sendroute. Based on that guess, I
put a code to show the trace but I don't have the expected results. (it
doesn't show all of the transit nodes as listed in the final result).

Thanks in advance,

Hai