quick fix to Fedora - remove a no in compose pkg from ks

    as migrate.after_extensive_io.iscsi needs scsi-target-utils
    and actually Fedora didn't include it in the compose,
    so the previous adding of it is a mistake, now remove it.
    also gray out the case for Fedora.
    
    CC: Jiri Zupka <jzupka@redhat.com>