add upgrade test from 2.5.0 to later version

Change-Id: Ifd07fa9ae99ce0a139bbf1ddf2ac7e04792f9528
Reviewed-on: http://review.couchbase.org/34006
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>