Fixes #1

[sar-gupta]

• rt was not defined but it was used. Removed the usage.
• rq->rq_hop_count is the correct representation for hop counts by RREQ packet.
• Random number was divided by 20, but it was already in range (0,1).
• Drop factor was multiplied by 1000, but it was already in range (0,1).
• srand(time(NULL)) was leading to generation of same random number every time.