The value of tQosIngPolicerSlopeMaxProb specifies the drop
probability, as a percentage, when the queue depth reaches
tQosIngPolicerSlopeMaxDepth. The drop increases steadily from 0 at
the tQosIngPolicerSlopeStartDepth up to the
tQosIngPolicerSlopeMaxProb at the tQosIngPolicerSlopeMaxDepth.