Comment 18 for bug 1550312

Reviewed: https://review.opencontrail.org/18468
Committed: http://github.org/Juniper/contrail-vrouter/commit/a2f91353b8488de562f91cd6e1f565d5a5c41c79
Submitter: Zuul
Branch: R2.21.x

commit a2f91353b8488de562f91cd6e1f565d5a5c41c79
Author: Divakar <email address hidden>
Date: Sat Feb 27 09:37:41 2016 +0530

Use innerpacket's destip as source ip while doing Tx Port mirroring

When Transmit port mirroring is enabled, packet received on Fabric
interface is right now mirrored using the source IP of the inner packet.
This results in RPF failure on Analyzer VM's compute node because the
compute node which is doing the port mirroring is using other compute
node's VM IP.

As a fix, if mirroring is Tax mirroring, rather using inner packets
source ip, dest ip is used, so that Analyzer VM's RPF will not have any
issues

closes-bug: #1550312

Conflicts:
 dp-core/vr_mirror.c
 dp-core/vr_nexthop.c

Change-Id: I43a3304f8186f3489c97be3093a5dbea4a247762