CBQE-1119: minor changes in verification of output

Change-Id: I7ccafe16a38530af2c9d0f804d18a266f6a47001
Reviewed-on: http://review.couchbase.org/26130
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>