When deleteing versioned objects proxy will try to restore the previous
copy. The COPY request will fail if the previous version is expired but
not handled by object-expirer.
This patch checks COPY respones on the previous copy, if it's
HTTP_NOT_FOUND(mostly because it's expired) proxy will try to restore
with the version before previous.
Closes-Bug #1308446
Change-Id: I17f049ea3ef62723effae8086ec427f6e151cd9c