remove some unnecessary loging and improve logging slightly

Change-Id: I81317b9af98996caee41add02b4ecdd6adf6ebee
Reviewed-on: http://review.couchbase.org/38721
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>