Create a macro for module declarations

The modules are now declared with a common macro. This allows future
additions to the module loading process while also making the loaded
symbol name a constant.

server/modules/routing/debugcli/debugcli.c

@@ -61,7 +61,7 @@ static CLI_INSTANCE *instances;
  *
  * @return The module object
  */
-MODULE_INFO* GetModuleObject()
+MODULE_INFO* MXS_CREATE_MODULE()
 {
     MXS_NOTICE("Initialise debug CLI router module.");
     spinlock_init(&instlock);