Thresholds of nodes to build circuits should be tunable and maybe consider weights too
On legacy/trac#5343, Mike notes that he doesn't like the 1/3 threshold for having sufficient exit nodes to build circuits. Arguably, this threshold (and the other threshold changed in legacy/trac#3196) should be consensus parameters too. Arguably, there should also (or instead?) be a minimum threshold by weight. I'm marking this for 0.2.4.x, but it's likely to be very backportable.
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