A single shell-driven shard sweep must process every bucket carrying
lifecycle config, not just the first one alphabetically. Pinned
because the scheduler iterates the buckets directory and a regression
that returns early after the first match would silently disable
lifecycle for every later bucket.
Two buckets, each with their own prefix-expiration rule and a
backdated object. Both must be expired after the same sweep.
Chris Lu
54954bb3eb