During doc generation, resources have their own templates and need
to be separate from non-resource modules. This removes the ``heat``
``engine`` and ``plugins`` folders and moves all resources into a
``resources`` folder, effectively separating the custom Rackspace
Client from custom Rackspace resources.
Partial-Bug: #1271226
Change-Id: Idbdc8400d30e2e745a2dc1b2d2fa1b7cff50d57b
bc9a1cc9c1