added skipped_reason for verbosity not met

fixes http://github.com/ansible/ansible-modules-core/issues/4062

lib/ansible/plugins/action/debug.py

@@ -73,6 +73,7 @@ class ActionModule(ActionBase):
             # force flag to make debug output module always verbose
             result['_ansible_verbose_always'] = True
         else:
+            result['skipped_reason'] = "Verbosity threshold not met."
             result['skipped'] = True
 
         return result