Mike Perez d46ee739d6 Set volume usage audit period to not NoneType
The setting of NoneType causes cinder-volume-usage-audit to not start up
and throw a stacktrace. This sets the config default back to something
it can use.

Change-Id: I4a9751025486b77dd7cf45d0aaad02e2325055d4
Closes-Bug: #1320541
2014-05-19 08:20:16 -07:00
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