CBQE-2494: index n1ql tests update

Change-Id: I5d58f79c6790bef49498a337605211f64243b279
Reviewed-on: http://review.couchbase.org/44396
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>