Comment 7 for bug 1461761

Reviewed: https://review.opencontrail.org/12142
Committed: http://github.org/Juniper/contrail-controller/commit/36746a15c59cf4a7358c9a2549740c259aff4e5e
Submitter: Zuul
Branch: R2.20

commit 36746a15c59cf4a7358c9a2549740c259aff4e5e
Author: Raj Reddy <email address hidden>
Date: Wed Jul 1 15:32:26 2015 -0700

When the socket has data to send, then the TCP_KEEPALIVE timer doesn't get
activated and it takes much longer time before the socket is closed.
TCP_USER_TIMEOUT also needs to be set for the keepalive to function
when there's traffic on the tcp socket. This will cause the socket
to close when the remote end is not reachable.

Change-Id: I90b9ece162babc4ccc23498eec6082d20fa6c461
Partial-Bug: #1461761