rgw: fix bug http://tracker.ceph.com/issues/39368 #1
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rgw: When using versioning, "call Rados::set_attrs for a version (for example, set self-defined metadata)" resulting in inconsistency between [BI_BUCKET_OBJS_INDEX: entry.meta.mtime] and [BI_BUCKET_OBJ_INSTANCE_INDEX: entry.meta.mtime], [DATA : mtime].(The current version cannot be correctly deleted in the lifecycle function)
related questions: ceph#17400