Updated openstack/openstack
Project: openstack/heat  99fccaf375dde2db5fe9e0581045a7b16dd4ba71

Don't import Properties class directly

Import the module, as required by H302:
http://docs.openstack.org/developer/hacking/#imports

Change-Id: I9dd15d2404bed0206442724c9b681b7f17ebea60