Investigate softflowd small packets

[bitkeks]

During development and testing I came about a situation where neighbor solicitation flows would cause softflowd to go crazy. Scenario: something in the network causes NS packets every 5-30 seconds. EACH of these flows will be picked up by softflowd as TWO flows (neighbor solicitation and neighbor advertisement). Then these flows will be exported. And for some reason, softflowd exports them in a single UDP packet each. Result: softflowd also captures each of these UDP packets as one flow, causing exponential packet generation.

This causes the collector to amout a massive stream of incoming packets, eventually even going OOM.