Updated openstack/openstack
Project: openstack/heat  a46171f4da5ff89ff716048f1bb443df1fc572c4

Support better access to nested attributes

This makes it easier to get access to attributes  with in
a nested stack.

bp env-nested-usability
Change-Id: I047794906ae7eb3b72b6cc779c64a9ba6e73e68a