Manager: Don't register the ipl and reactbundle module

Both are superseded by their respective library. This
way we make sure there are no competing auto loaders.

library/Icinga/Application/Modules/Manager.php

@@ -228,7 +228,11 @@ class Manager
         } else {
             $module = new Module($this->app, $name, $basedir);
         }
+
+        if ($name !== 'ipl' && $name !== 'reactbundle') {
             $module->register();
+        }
+
         $this->loadedModules[$name] = $module;
         return $this;
     }