CBQE-927: add upgrade test with hostnames

Change-Id: I560f4abb1e563d83c799ad1aed69985f93d3d4da
Reviewed-on: http://review.couchbase.org/27209
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>