Correct yo-yo shutdowns:

Apparently some machines don't detect a clean (i.e. software initiated)
shutdown; and ignore the 'wake on AC loss' bit, meaning they wake up
immediatly after being told to shutdown e.g. via shutdown -hp.

So now we continue preserve the wake on AC loss behaivour, howerver if we
initiate a clean shutdown we clear this bit so that it the machine does not
immediately power back up again.

ok kettenis@

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