CBQE-1531: add order by tests

Change-Id: I004932093bcf05bb7ca9be31bfa7493965ef48a2
Reviewed-on: http://review.couchbase.org/29126
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>