Disable systemd resolved
    
    Fixes flake: 'dial tcp: lookup cdn03.quay.io: no such host'
    
    Okay, doesn't actually fix as in _fix_, just fix as in "sweep it
    under the rug". The actual bug is in systemd-resolved, or in the
    quay.io/cloudflare.net DNS nameservers, or in the weird specific
    setup for cdn03 (it's a CNAME, compared to cdn01/02 which are A).
    Maybe a combination of all of the above. I don't care; I just
    want the flakes gone. I realize that this makes our testing
    environment different from default Fedora, and am okay with
    that because I suspect many Fedora users disable systemd-resolved
    as SOP.
    
    Signed-off-by: Ed Santiago <santiago@redhat.com>