CBQE-0:n1ql add some more logs

Change-Id: I124692e73bf91a0349275842dceb12ef86140e35
Reviewed-on: http://review.couchbase.org/43651
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>