CBQE-1531: add index check for index tests tuq

Change-Id: I6fb0e1b17f731fea5cddbf93e5373891a91d85ed
Reviewed-on: http://review.couchbase.org/29452
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>