re-factoring in menelaus_stats
re-factoring in menelaus_stats

Change-Id: Ic98402c22feca95d2b4a7c8cd29a04c7e3d70ed1
Reviewed-on: http://review.couchbase.org/87123
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

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