Collect extended socket stats (ss --info --processes).
Collect extended socket stats (ss --info --processes).

Which gives lots of low-level information about sockets, like how much
time passed since the last send/recv, some congestion control
info. But unfortunately not last acked byte which I hoped I'd get with
this change.

Also get the information about process owning the socket (and which
file descriptor the socket corresponds to).

Change-Id: Ifea3c0856d40a8126e92dccad5f43443d6856b7b
Reviewed-on: http://review.couchbase.org/57668
Well-Formed: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Tested-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Chris Malarky <734d58e923edeaf928b45173389f81ad782e799d@couchbase.com>

ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server