Netest output for measuring bandwidth

• Read output for -abw mode

1. measuring available bandidth capable to do it
2. measuring available bandidth maximum throughput only

This output is much simplier than the general measurement. It has only two sections. The first section reports both available and physical bandiwdth if available bandwidth is measurable; otherwise, it reports the maximum throughput and estimated physical bandwidth.
The second section reports Round Trip Time (RTT), Maximum burst size, and what limits the maximum throughput.

Case 1: Detected Available bandwidth

The output from netest client running in ABW mode:

FreeBSD% netest -t xxx.yyy.edu -abw

===== Testing results: to xxx.yyy.edu =====
--- General statistics ---
Average bandwidth used in testing: 57.2572 Mb/s in 2.2707 sec
Bandwidths:     Available 554.125        Capacity 622.000 Mb/s


--- General section ---
        Round Trip Time (RTT):          2.4000 ms
        Maximum burst size:             1529408 Bytes (pkt size 1472)
Transient Peak throughput is 671.346 Mb/s  limited by local memory

Case 2: No ABW but maximum throughput and bottleneck capacity

The output from netest client running in ABW mode:

FreeBSD% netest -t xxx.yyy.142.75 -abw

6639176 Bytes dropped (57.1496 %) ReTx 0

===== Testing results: to xxx.yyy.142.75 =====
--- General statistics ---
Average bandwidth used in testing: 7.8463 Mb/s in 11.2960 sec
Maximum throughput 722.767 Mb/s Estimated Capacity 1000.000 Mb/s


--- General section ---
        Round Trip Time (RTT):          159.4000 ms
        Maximum burst size:             1377792 Bytes (pkt size 1472)
Transient Peak throughput is 722.767 Mb/s  limited by local memory