issues with network script

[Jeff Lane ]

network script has some issues that are just becomming evident.

1: on high speed nics, for now, it needs to drop to iperf2 as that provides better performance results. We'll make a better attempt later.

2: reporting is not correct. The more I stare at the results the more I think it needs to simply get the final SUM and average that across num_runs. The way it works now results in this (for example on a 25Gb NIC):

[ 5] 0.0-60.0 sec 56108 MBytes 7844 Mbits/sec
[ 4] 0.0-60.0 sec 56122 MBytes 7846 Mbits/sec
[ 3] 0.0-60.0 sec 56120 MBytes 7846 Mbits/sec
[SUM] 0.0-60.0 sec 168350 MBytes 23537 Mbits/sec

DEBUG:root:Min Transfer speed: 7835.0 Mb/s
DEBUG:root:Max Transfer speed: 23572.0 Mb/s
INFO:root:Avg Transfer speed: 11768.442622950819 Mb/s
INFO:root:47.07% of theoretical max 25000 Mb/s
WARNING:root:Poor network performance detected against 192.168.122.65
WARNING:root: Transfer speed: 11768.442622950819 Mb/s
WARNING:root: 47.07% of theoretical max 25000 Mb/s

Note this really shoudl have been a passing result as the iperf sum shows 23Gb/s.

This was never evident on 10Gb or slower, and I'm not entirely sure why it's only showing now, but I think the fix here is to just get the SUM line from the output and forget the rest of the math.