Fix trust listing
Fix trust listing

The existing list operation was not functioning properly. This patch
fixes it by returning the match trust immediately when a match is found.

Change-Id: Ic18bdf0b168a50d48b4cb2a67321f9088bbe37e3

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