The value of tSapIngPolicerSlopeMaxProb specifies the drop
probability, as a percentage, when the queue depth reaches
tSapIngPolicerSlopeMaxDepth. The drop increases steadily from 0 at
the tSapIngPolicerSlopeStartDepth up to the
tSapIngPolicerSlopeMaxProb at the tSapIngPolicerSlopeMaxDepth.