CBQE-0: tuq:add more logs for failed cases

Change-Id: Iaea9f9fe3113c4f1ae00faceabed0ac713b1025a
Reviewed-on: http://review.couchbase.org/30881
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>