The value of tQosEgrPolicerSlopeMaxProb specifies the drop
probability, as a percentage, when the queue depth reaches
tQosEgrPolicerSlopeMaxDepth. The drop increases steadily from 0 at
the tQosEgrPolicerSlopeStartDepth up to the
tQosEgrPolicerSlopeMaxProb at the tQosEgrPolicerSlopeMaxDepth.