CBQE-1531: add back up +tuw tests

Change-Id: Id0740473796865c9502a9d627f5377fbc73b95af
Reviewed-on: http://review.couchbase.org/29546
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>