throttle group_orders ajax updates
throttle group_order_article updates
allow to config group_orders ajax throttling (complements 2700aa51cea083cec3b831feea69d84e993ccf29)
fix spec for server-side throttling (complements f9de2970533fec7fb9e2e12ec6d55a479ee32b19)
fix goa throttle (complements f9de2970533fec7fb9e2e12ec6d55a479ee32b19)