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/modules/routing/schemarouter/schemarouterinstance.hh

@@ -34,7 +34,7 @@ class SchemaRouter: public mxs::Router<SchemaRouter, SchemaRouterSession>
 {
 public:
     ~SchemaRouter();
-    static SchemaRouter* create(SERVICE* pService, char** pzOptions);
+    static SchemaRouter* create(SERVICE* pService, MXS_CONFIG_PARAMETER* params);
     SchemaRouterSession* newSession(MXS_SESSION* pSession);
     void diagnostics(DCB* pDcb);
     json_t* diagnostics_json() const;