chutney verify: make amount of data sent configurable (Tor load / performance testing)

There is a need to load-test Tor relays when bringing them up, and to performance-test tor in general, whether relaying or hidden services.

See: Tor BSD Underperformance https://lists.torproject.org/pipermail/tor-dev/2015-January/008048.html Simulate high Tor load https://lists.torproject.org/pipermail/tor-relays/2015-January/006203.html

It's possible to manually modify the amount of random data sent while verifying connectivity (look for "Octets" in chutney's TorNet.py). But it would be nice if this amount was configurable.

Nick, is this SponsorR, or SponsorS, or both?

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