Take static module capabilities into use

The static module capabilities are now used to query the capabilities of
filters and routers. The new RCAP_TYPE_NOAUTH capability is also taken
into use. These changes removes the need for the `is_internal_service`
function.

server/modules/routing/readwritesplit/readwritesplit.c

@@ -161,7 +161,7 @@ MXS_MODULE *MXS_CREATE_MODULE()
         MXS_MODULE_API_ROUTER, MXS_MODULE_GA, MXS_ROUTER_VERSION,
         "A Read/Write splitting router for enhancement read scalability",
         "V1.1.0",
-        MXS_NO_MODULE_CAPABILITIES,
+        RCAP_TYPE_STMT_INPUT | RCAP_TYPE_TRANSACTION_TRACKING,
         &MyObject,
         NULL, /* Process init. */
         NULL, /* Process finish. */
@@ -821,7 +821,7 @@ static void clientReply(MXS_ROUTER *instance,
  */
 static uint64_t getCapabilities(MXS_ROUTER* instance)
 {
-    return RCAP_TYPE_STMT_INPUT | RCAP_TYPE_TRANSACTION_TRACKING;
+    return RCAP_TYPE_NONE;
 }
 
 /*