CBQE-2237: add hostname mgmt tests with cluster ops

Change-Id: Ie0f4d1ec19ea5d78c483e284d22270cc1ae3b306
Reviewed-on: http://review.couchbase.org/39352
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>