dracut.spec: add dracut-init.sh
use mktemp "-p" instead of "--tmpdir" for busybox
TODO: update
dracut-systemd/dracut-initqueue: only start ser...
network: add rd.peerdns=0 parameter
crypt: skip crypttab entries with the same device
dracut.sh: remember $0 for --regenerate-all
dracut.sh: reduce code