CBQE-1531: add max_verify parameter

Change-Id: Ife2425a6c5fe572912c7fb047020cb52ee919cc4
Reviewed-on: http://review.couchbase.org/29128
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>