Add a workaround for RHBZ #2268505
    
    My anaconda patch for ensuring we get an EFI boot manager entry
    on installs using bootupd (currently only 'canned', i.e. Atomic,
    installs - IoT and Atomic Desktops - are affected) was rejected
    and dropped in the latest Rawhide build. It'll probably also be
    lost in the next F40 build. So install tests of affected images
    have started failing. This is a kinda awkward workaround: on
    UEFI canned installs, we check whether it looks like there is no
    "Fedora" efibootmgr entry, and if so, we delete the entry for the
    optical drive, so hopefully we'll boot via fallback path from
    the hard disk on reboot.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>