CBQE-2326: add hostname mgmt negative tests

Change-Id: I0542d96aebb9745bd8ddd1c48bad9ceb4ddf3aaa
Reviewed-on: http://review.couchbase.org/39353
Reviewed-by: Meenakshi Goel <meenakshi.goel@globallogic.com>
Tested-by: buildbot <build@couchbase.com>