update fs_xfs and fs_ext4_preselected needles
    
    these rarely get used any more. they're only used when we're
    running the filesystem tests on a non-Server image, where the
    default fs is ext4 not xfs. With the old nightly process, where
    we only got a generic boot.iso, we used them all the time, but
    now we get product-ized nightlies, we rarely do. But I did hit
    them today running the universal tests with a generic boot.iso
    I hand-built to test an anaconda update, so in case we need to
    do that kind of thing again in future, we may as well update
    the needles.