[Bloat] Speed tests - attribution of latency to relevant network hops

[Dave Taht]

The tool for looking at this is called "mtr", which is available in
various forms for linux, osx, and windows.

It was originally part of the rrul spec, but parsing it's output is a
little difficult (or was - there is csv support for it now in linux
mainline), and the biggest reason left (besides lack of time to
implement it - patches gladly accepted!) we don't use it yet is that
it imparts enough traffic to measurably jigger the other results at
lower bandwidths.

Certainly, instead of blending together the outputs of multiple
separate tools as we currently do with flent, it would be better to
have one specific tool that measured everything we care about all at
the same time and (for example) saw, rather than estimated, acks - but
that requires a scale of development effort and funding that we have
never had.

I do have hope that one day webrtc could be leveraged to give us udp
measurements from within a browser. The current dslreports ping over
tcp method is subject to a multiplicity of problems. I would not mind
at all if browsers gained the ability to set the ttl, also.