add behaviour penalty threshold #377
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Adds a (optional) threshold for behaviour penalties, above which it activates.
This is similar to the IPColocation threshold.
Behaviour is unchanged if the threshold is unset (0).
Rationale: it has been observed that some overloaded lotus nodes fail to to follow up to IWANT requests; this threshold allows us to reduce the impact and only penalize the peer if the misbehaviour is persistent.