Rename MODULE_INFO to MXS_MODULE

The MODULE_INFO is now the main object which is used by modules to convey
information to the MaxScale core. The MXS_MODULE name is more apt as it
now contains the actual module definition.

The old MODULES structure was moved into load_utils.c as an internal
implementation and was renamed so that it is not confused with the new
MODULE structure.

server/modules/monitor/galeramon/galeramon.c

@@ -59,7 +59,7 @@ bool isGaleraEvent(monitor_event_t event);
  *
  * @return The module object
  */
-MODULE_INFO* MXS_CREATE_MODULE()
+MXS_MODULE* MXS_CREATE_MODULE()
 {
     MXS_NOTICE("Initialise the MySQL Galera Monitor module.");
 
@@ -70,10 +70,10 @@ MODULE_INFO* MXS_CREATE_MODULE()
         diagnostics
     };
 
-    static MODULE_INFO info =
+    static MXS_MODULE info =
     {
-        MODULE_API_MONITOR,
-        MODULE_GA,
+        MXS_MODULE_API_MONITOR,
+        MXS_MODULE_GA,
         MONITOR_VERSION,
         "A Galera cluster monitor",
         "V2.0.0",