[SNMP4J] getTable is not returning or not throwing exception when there is a cable pull

[Murali Kakula-A20718]

I was using getTable (Asynchrnous mode) system call from TableUtils, and
I pulled the cable out from my PC and it seems getTable is not returning
from that system call and also it is not throwing any exception also.
Any Clue what is the reason for this, Whereas if I use get it is giving
an exceptiton. indicating that it is not able to send the message.
 
Murali.