- added compatibility mode for EFI images on SLE11
  * SLE11 supports EFI only via the elilo bootloader with one
    exception which is secure boot. In that mode the grub2
    signed module is used and the functionality is hidden
    behind an elilo wrapper program so that all tools e.g yast
    doesn't have to really support grub2. In order to leave
    a SLES image in a supported state it was required to adapt
    to this layout in kiwi