CBQE-1531: fix order by tests

Change-Id: I80a80f20d9c2da699d1e90b8753cc5391eb2b178
Reviewed-on: http://review.couchbase.org/29253
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>