hooks: add shutdown_preumount hook

This would be useful for filesystem monitoring software which needs to
capture all changes to the filesystem - including the final writes to
the random seed and wtmp.

[tomegun: this hook is now the same as the postkillall hook, but that might
change, so I agree with adding it for the sake of having sane semantics.]

Signed-off-by: Devin J. Pohly <djpohly+arch@gmail.com>
Signed-off-by: Tom Gundersen <teg@jklm.no>

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