Add two more test cases to cover environment module
Add two more test cases to cover environment module

This patch adds two more test cases to achieve 100% coverage for
environment module.

Change-Id: I9bee3dfaaeda9c654c2a71d5968fdb8490d52148

openstack/senlin,Alzon/senlin,stackforge/senlin,tengqm/senlin-container,openstack/senlin,stackforge/senlin,Alzon/senlin,tengqm/senlin-container,openstack/senlin