Updated openstack/openstack
Project: openstack/heat  9e60b408c178844ac54b0c83a8be1807f3c2854b
null
Docs: use the plugin manager to list resources

This allows us to generate docs for all resources, not just the available
ones.

Change-Id: I7691c82a1f5872cd2389c2133c8c11c12d13b25b