CBQE-1531: add possibility to run tuq_client on a different server

Change-Id: Ie219cb9f07ad999f8a3ee3036ef52fa322a583dc
Reviewed-on: http://review.couchbase.org/29446
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>