Bugfix, and protect switch flashes via feature.
We now protect switch reloads via the SwitchFlash feature. We don't really give people a lot of advance warning about this, and we wait long enough that it will irritatingly fail your experiment swapin. Ideally we should check before anything starts happening, but we don't know if we *have* to reload until we see what's on the nswitch node that gets allocated to us... and by the time nodes are allocated, I think they end up having to go through reloading if *any* of them fails. Not sure though. Also fixup handling of multiple libossetup_switch ops; if one fails, abort the list instead of continuing on.
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