relay: We might be noting down an unknown DNS error type

Signed-off-by: David Goulet <dgoulet@torproject.org>
9 jobs for ticket40388_047_01 in 15 minutes and 1 second (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #20803
debian-disable-dirauth

00:05:49

passed #20804
debian-disable-relay

00:05:59

passed #20799
debian-distcheck

00:07:56

passed #20800
debian-docs

00:02:38

passed #20798
debian-hardened

00:07:41

passed #20801
debian-integration

00:14:24

passed #20797
debian-minimal

00:06:19

passed #20805
debian-nss

00:05:44

passed #20802
debian-tracing

00:08:41