TODOs for grml-terminalserver
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  * resolv.conf should be copied from the initrd
  * DON'T delete /var/lib/tftpdboot on a !grml-system
  * config vars to use external services (dhcp, tftp, nfs)
  * make pxelinux configurable (to use another pxe-boot-manager) (MAYBE)
  * build binaries (timeout, udhcpc,...) from source