Remove router_options

Relaced router_options with configuration parameters in the createInstance
router entry point. The same needs to be done for the filter API as barely
any filters use the feature.

Some routers (binlogrouter) still support router_options but using it is
deprecated. This had to be done as their use wasn't deprecated in 2.2.

server/core/internal/service.h

@@ -110,12 +110,6 @@ bool service_server_in_use(const SERVER *server);
 /** Update the server weights used by services */
 void service_update_weights();
 
-/**
- * Alteration of the service configuration
- */
-void  serviceAddRouterOption(SERVICE *service, char *option);
-void  serviceClearRouterOptions(SERVICE *service);
-
 /**
  * @brief Add parameters to a service
  *