`dracut-initramfs-restore.sh` fails on ostree-based systems about dracut HOT 3 CLOSED

cc: @jlebon @cgwalters

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(Might want to open this against https://github.com/dracut-ng/dracut-ng instead.)

OK yeah, I thought FCOS/RHCOS didn't actually use the initramfs on shutdown. And it doesn't by default, but that changed when we started supporting iSCSI and multipathing, whose dracut modules both use need_shutdown (which is what signals that going back to the initramfs at shutdown is desirable).

So yeah... booting FCOS with multipath enabled reproduces this bug. Which means we weren't running this bit of code. Though talking with @bmarzins, the consequence of this cannot result from data loss in any way.

As for iSCSI, the module itself doesn't install a shutdown hook like the multipath one does, but maybe it's for the purpose of running the generic umount shutdown code to unmount the rootfs to ensure all data is flushed back to the target?

But yes, we should definitely fix this.

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Closed in favor of dracut-ng/dracut-ng#514

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