CBQE-0: add logs to hostname mgmt tests

Change-Id: I75ba7e057f90d15c479ce79bbc8028e936406980
Reviewed-on: http://review.couchbase.org/30688
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>