Comment 4 for bug 1586246

Reviewed: https://review.opencontrail.org/23210
Committed: http://github.org/Juniper/contrail-controller/commit/fb9fa3f0579792518d76dbf24dd7aeb9bdfdc208
Submitter: Zuul
Branch: master

commit fb9fa3f0579792518d76dbf24dd7aeb9bdfdc208
Author: Ashok Singh <email address hidden>
Date: Thu Aug 11 04:58:38 2016 -0700

Flow Sampling changes

1.Do gradual reduction of flow-threshold when flow-export-rate has come
down after reaching a high value (instead of resetting it to default threshold)
2.Do not disable sampling of flows when flow-export-rate drops to below 80% of
configured rate after reaching high values
3.Define a minimum threshold value 20
4.Define a tracebuffer to log flow-export-rates and thresholds

Also removed unused variable in FlowStatsCollector object.

Change-Id: I74e7baa84f2792bc451804fda350a75f817d1f6e
Partial-Bug: #1586246