Fix coverage test failed problem
Fix coverage test failed problem

This patch temporarily slove coverage test failed problem which is casued by
test__dump_guarded method.

Closes-Bug: #1653850

Change-Id: I4b5221172109466f090dcaa84e3a039eb803227e

openstack/senlin,stackforge/senlin,stackforge/senlin,openstack/senlin,openstack/senlin