added support in iperf for different result formats. 

also added upper bounds for hifi tests. There were also a few small errors in the tests including:

- didn't take arp into account on link delay test
- needed to convert from percentage to decimal on cpuLimit test
- UserSwitch was not fast enough to have a 5Mbps bandwidth, so changed test to .5 Mbps

fixes #231
fixes #215
Why are you dividing cpu by 100?