CBQE-2494: update index n1ql tests

Change-Id: I67c51d0a2127b61370961f7bd52d285ead848b01
Reviewed-on: http://review.couchbase.org/44393
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>