CBQE-0: disable n1ql index tests for now

Change-Id: I76e75f5bd26c2caa6a4ca34fa9bc1924a565452e
Reviewed-on: http://review.couchbase.org/43564
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>