cmd/relaynode: drop local --acl-file in favour of central packet filter.

relaynode itself is not long for this world, deprecated in favour of
tailscale/tailscaled. But now that the control server supports central
distribution of packet filters, let's actually take advantage of it in
a final, backward compatible release of relaynode.

cmd/relaynode/tailscale-relay.spec.in

@@ -28,14 +28,12 @@ mkdir -p $D/usr/sbin $D/lib/systemd/system $D/etc/default $D/etc/tailscale
 cp taillogin tailscale-login relaynode $D/usr/sbin
 cp tailscale-relay.service $D/lib/systemd/system/
 cp tailscale-relay.defaults $D/etc/default/tailscale-relay
-cp acl.json $D/etc/tailscale/acl.json
 
 %clean
 
 %files
 %defattr(-,root,root)
 %config(noreplace) /etc/default/tailscale-relay
-%config(noreplace) /etc/tailscale/acl.json
 /lib/systemd/system/tailscale-relay.service
 /usr/sbin/taillogin
 /usr/sbin/tailscale-login