osbase/net/dns: add new DNS server

This adds a new DNS server service, which will replace CoreDNS. The
service has built-in handlers for certain names, but all other names
will be handled by runtime configurable handlers.

Change-Id: I4184d11422496e899794ef658ca1450e7bb01471
Reviewed-on: https://review.monogon.dev/c/monogon/+/3126
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/osbase/net/dns/hosts b/osbase/net/dns/hosts
new file mode 100644
index 0000000..77c24a1
--- /dev/null
+++ b/osbase/net/dns/hosts
@@ -0,0 +1,2 @@
+127.0.0.1 localhost
+::1 localhost