Updated openstack/openstack
Project: openstack/swift  5f202b598a83cb9e1eb4e9a803d082d8dd588bf9

Shard expiring object container

All the expiring objects for a given X-Delete-At are funnelled into the
same expiring object container- this can act as a bottleneck.

Change-Id: I288a177a7ae3e213c727a2a81fa76d4ef9cf7eb3