remove accidently committed excessive debug logging

Change-Id: I913246695cf1d114ad56d3b4edc3913753bfe6c4
Reviewed-on: http://review.couchbase.org/31736
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>