Comment 9 for bug 1510342

I don't think there's any reason to add a delay, if we want EC to support a fail in place strategy we should just rebuild when we get the 507

the questions is really just *where* to rebuild (imagine multiple unmounted disks, we don't want two frags rebuilt to the first handoff)

eventually someone will replace the drive and if there's a ring change they'll probably flop over to rebalance mode and have a good chance of the rebuilt fragment from the handoff making it's way over to the new primary instead of being rebuilt again