Revert "Drop use of the x86-baremetal-tools group"
    
    This reverts commit 1841b368cef9b1c6226644301ed5c3893a363422. It
    turns out we need to revert to older lorax that uses syslinux for
    now - see https://pagure.io/pungi/issue/1608 - so we need it back
    in the live kickstart too.