Comment 1 for bug 1521500

Reviewed: https://review.opencontrail.org/15477
Committed: http://github.org/Juniper/contrail-vrouter/commit/8d9a87f2c34b61ddb1bb295604515053e2fd7860
Submitter: Zuul
Branch: R2.20

commit 8d9a87f2c34b61ddb1bb295604515053e2fd7860
Author: Anand H. Krishnan <email address hidden>
Date: Mon Nov 30 14:14:14 2015 +0530

Logic to reset statistics of the evicted reverse flow

The point where we reset statistics for an evicted flow is when we
trap the first packet to the agent. The trap message carries the
old statistics. However, for the reverse flow, there is no trap.
Hence, the statistics of the evicted reverse flow entry is sent
back to the agent in the sandesh flow message and reset once the
agent tries to add the reverse flow entry.

Change-Id: Ic67318b9632f39560292512be503f90eb6f33068
Closes-BUG: 1362701