Updated openstack/openstack
Project: openstack/heat  4a3f4522afb27e3537b997ee3168269f904a258a

tests remove stack_delete_after decorator

This is no longer required because cleanup is provided via reset
of the dummy db in all tests which call the base-class setUp.

Change-Id: I49cbfce0b2880d0318114df35d4abaed61d03bfc