CBQE-0: fix negative scenarios n1ql

Change-Id: I589d40ade636a8509e47882a4048fec431de8548
Reviewed-on: http://review.couchbase.org/43411
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>