CBQE-0:add more logs

Change-Id: Id0faf7fb7f0696b417f7ec46475558ddde27c84c
Reviewed-on: http://review.couchbase.org/41637
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>