N1QL: negative error messages changed

Change-Id: I85233ed055433c2cdd93c42bbbc15f3506c7f2ac
Reviewed-on: http://review.couchbase.org/43911
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>