Comment 12 for bug 1737963

Reviewed: https://review.opencontrail.org/48931
Committed: http://github.com/Juniper/contrail-vrouter/commit/3e7d1ff921c124c6b8f5cb4a1068f5050f0c624b
Submitter: Zuul v3 CI (<email address hidden>)
Branch: master

commit 3e7d1ff921c124c6b8f5cb4a1068f5050f0c624b
Author: Anand Narayanan Rao <email address hidden>
Date: Mon Jan 28 13:09:28 2019 +0530

Do not decrement TTL while doing L3 forward to agent pkt0

In BGPaaS in pkt mode, the pkt will be L3 routed with the NH
pointing to pkt0 or GW interface at one stage (before NAT).
In single hop BGPaaS case, since the TTL is decremented in
vr_forward() during L3 routing, the pkt is dropped later
since the TTL becomes 0. This leads to BGP session not
coming up at all.

Change-Id: I68d482a903de9067464d75fe269d74f9d2beaf67
Closes-Bug: #1737963
closes-jira-bug:#JCB-199874