public void receivedStatus(OperationStatus s) {
            // Nothing special when receiving status, only
            // necessary to complete the interface
          }
Wait for the queues to die down.

@param timeout the amount of time time for shutdown
@param unit the TimeUnit for the timeout
@return result of the request for the wait
@throws IllegalStateException in the rare circumstance where queue is too
          full to accept any more requests
src/main/java/net/spy/memcached/TapConnectionProvider.java