The value of tSapEgrPolicerSlopeMaxProb specifies the drop
probability, as a percentage, when the queue depth reaches
tSapEgrPolicerSlopeMaxDepth. The drop increases steadily from 0 at
the tSapEgrPolicerSlopeStartDepth up to the
tSapEgrPolicerSlopeMaxProb at the tSapEgrPolicerSlopeMaxDepth.