Add a rate limit to Impairments module

[acooks]

Background Most people think of throughput as the defining characteristic of any network transport, rather than delay and delay variation. JitterTrap currently lacks the ability to specify the maximum throughput.

Tasks

1. Add support for the 'rate' parameter of the netem qdisc to libnl.
2. Work with upstream to merge this.
3. Add support for specifying the rate to index.html.
4. Add support for rate parameter to netem config messages.

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