Greg Lange 209c5ec418 Add parallelism to object expirer daemon.
Two types of parallelism are added:

- concurrency to speed up what a single process does
- a way to run multiple daemons to work on different parts of the work

DocImpact

Change-Id: I48997f68eb2fd8de19a5ee8b9fcdf76dde2ba0ab
2013-06-07 20:49:47 +00:00
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