CBQE-1476: add test for read only user ui

Change-Id: Ie891694bca3761ddd91a77fdc022f2a08adbd314
Reviewed-on: http://review.couchbase.org/27883
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>