CBQE-0: add pause for ui test

Change-Id: Id7d74056e10b4fc6b6b7b443594a3ab6eedf21de
Reviewed-on: http://review.couchbase.org/28291
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>