Updated openstack/openstack
Project: openstack/heat  c5e93e6c6b4ede23d4ed73accad262949fe8073d
null
use msg_fmt not message in Exceptions

This doesn't solve the problem yet, but clarifies
the format string from the final string.

Partial-bug: #1243883
Change-Id: Ia0f19423248304984cc53926dfb87c6a49c90e11