CBQE-1805: fix results verification task calling

Change-Id: I1739576e6739d4901a4b2dcf965c34eb97b18548
Reviewed-on: http://review.couchbase.org/31548
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>