Utilize the underlying createCommand method

This change will allow the command class to be overridden to support
subclasses of RegisteredServiceImpl

cas-server-core/src/main/java/org/jasig/cas/services/web/RegisteredServiceSimpleFormController.java

@@ -46,6 +46,7 @@ public RegisteredServiceSimpleFormController(
         final IPersonAttributeDao attributeRepository) {
         this.servicesManager = servicesManager;
         this.personAttributeDao = attributeRepository;
+        this.setCommandClass(RegisteredServiceImpl.class);
     }
 
     /**
@@ -93,7 +94,7 @@ protected Object formBackingObject(final HttpServletRequest request)
 
         if (!StringUtils.hasText(id)) {
             logger.debug("Created new service.");
-            return new RegisteredServiceImpl();
+            return this.createCommand();
         }
 
         final RegisteredService service = this.servicesManager.findServiceBy(Long.parseLong(id));