Remove unneeded iotools

[tlaurion]

iotools is unneeded, remove it.

Yes, that's a "historic artifact" .... I'd suggest then also removing iotools as this is only needed here.
Although if somebody wants to overwrite the entire flash (not just the bios region) - rebooting will fail afterwards, right @macpijan ? but under the line this shouldn't happen anyways, so removing both (iotools + shutdown-instead-of-reboot) should be fine

Originally posted by @daringer in #1704 (comment)