Previously the stack list command would error out if any stacks were present. This was due to the action code attempting to index on a stack object, rather than grabbing its attributes. This change switches the action code to use the proper utility for a resource instead of a dict. Change-Id: Ia6b73d5c1ba7f7e3d7bc5493167da81062102b42 Blueprint: heat-support-python-openstackclient