Updated openstack/openstack
Project: openstack/heat  dce34d7bf57c870b17141cd31657e08e7760c9e7

RandomString don't skip superclass validation

Ensure the superclass validation happens as well as the class-local
additional stuff.

Change-Id: I3fdc6e5d6a4ca741cdd12ca0ed6ceb908c03ae9f
Closes-Bug: #1392754