Latency and bandwidth better tests

[knmcguire]

Currently we have a good table of which tests passed and failed but we have none for the bandwidth and latancy tests, so let's add that!

We do have to think about a better measurement for the bandwidth test but we can look at this issue on possible improvements on that:
bitcraze/crazyflie-lib-python#469

[gemenerik]

Latency tests were changed to use the new lib latency implementation.