Delete mox.stubs in heat
Delete mox.stubs in heat

This patch deleted mox.stubs which was redundance
in unit test.

Change-Id: Id2decb5be6be079b55e3a1e2da048009cacafc25
Implements: blueprint mox-to-mock-conversion

cwolferh/heat-scratch,noironetworks/heat,openstack/heat,openstack/heat,cwolferh/heat-scratch,noironetworks/heat