Updated openstack/openstack
Project: openstack/heat  682c62717a07cd33798ba0a983c888aed88f09df

unit tests: Don't mess with template retrospectively

In a couple of places we were modifying the template after creating the
stack with it, which is obviously not guaranteed to work.

Change-Id: I572cf6d7ac58392a9eb983ba8602481d0123c401