CBQE-0: logger doesn't contain 'fail' method

Change-Id: I0f4d4320146c33b6d7b30df7d9da2e71d22866a1
Reviewed-on: http://review.couchbase.org/32733
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>