[WIP]collect aws cloudformation templates and stacks at Amazon refreshing

These bottom three should all be tests on the corresopnding assert_specific_* methods.  e.g. assert_specific_vm should have a .cloud_stack reference test.  If there isn't one, we should create an `EmsRefreshSpec-Vm-CloudStack` vm that has a reference, and check it in a `assert_specific_vm_on_cloud_stack` method.