NOJIRA: fix pizzashop.roo sample

Without this quick patch, we have the error below with the PizzaShop sample.

~.web roo> service --interface ~.service.ToppingService --entity ~.domain.Topping
Command 'service --interface ~.service.ToppingService --entity ~.domain.Topping' not found (for assistance press TAB or type "hint" then hit ENTER)
addon search --requiresCommand "service" found no matches

Thanks.