CBQE-0: add logs

Change-Id: I216d5a9e68bf65963a4bb3306984d7e5123be1e7
Reviewed-on: http://review.couchbase.org/27385
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>