Drop use of the x86-baremetal-tools group
    
    It only has syslinux in it (it used to also have memtest86+ till
    we dropped that), and we're not using syslinux any more.
    syslinux was also listed in anaconda-tools so this was really
    kinda redundant; we will replace syslinux with the necessary
    grub2 packages in comps.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>