cbqe-0: change hardcoded timeout for wait_timeout

Change-Id: Ieed8fd2ccb9b9f954783a58847367116bc56e570
Reviewed-on: http://review.couchbase.org/40121
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>