Comment 4 for bug 1373360

The bug shows up in oslo-incubator version of generator.py, at the moment we are so close to juno and this fix can go only in stable/juno branch. However, the ceilometer team has a work around and no one else needs it. So marking this as invalid in oslo-incubator unless someone else hollers.

Related note, oslo.config's copy of generator.py is *very* lenient and has to be tightened up to validate the default values properly AND as a consequence the template string has to be handled as well. I'll be doing this in:
https://review.openstack.org/123914