Fixed Bug 1187200

See Bug 1187200 for a full description of the problem.

Part 1:

X-Delete-At-Container added to X-Delete-At-* info

This fixes the bug by passing the expiring-objects-account's
container name onward to the backend object servers. This is in case
the object servers' expiring_objects_container_divisor happens to be
different than the proxy server's, we want to make sure the host,
partition, and device match up with the container name. Different
container names would be fine, but not with mismatched host,
partition, and device info.

Part 2:

The db_replicator now double checks the disk path's partition against
the partition the ring gives back. If they don't match, it logs the
problem but continues to replicate the database to where it should be
and, on success to all proper nodes, removes the local out of place
database.

Bug 1187200

Change-Id: Id0873a3f2198ce285fe0b0c777738eff38bc2438
Merge "Fixed Bug 1187200"