migrate snooper tests to use new local DNS server

LICENSE-3rdparty.csv

@@ -1175,6 +1175,7 @@ core,github.com/mdlayher/netlink/nlenc,MIT,Copyright (C) 2016-2022 Matt Layher
 core,github.com/mdlayher/socket,MIT,Copyright (C) 2021 Matt Layher
 core,github.com/mholt/archiver/v3,MIT,Copyright (c) 2016 Matthew Holt
 core,github.com/microsoft/go-rustaudit,MIT,Copyright (c) Microsoft Corporation
+core,github.com/miekg/dns,BSD-3-Clause,"Alex A. Skinner | Alex Sergeyev | Andrew Tunnell-Jones | Ask Bjørn Hansen | Copyright (c) 2009, The Go Authors. Extensions copyright (c) 2011, Miek Gieben | Copyright 2009 The Go Authors. All rights reserved. Use of this source code | Copyright 2011 Miek Gieben. All rights reserved. Use of this source code is | Copyright 2014 CloudFlare. All rights reserved. Use of this source code is | Dave Cheney | Dusty Wilson | James Hartig | Marek Majkowski | Miek Gieben <[email protected]> | Omri Bahumi | Peter van Dijk | copyright (c) 2011 Miek Gieben"
 core,github.com/mitchellh/copystructure,MIT,Copyright (c) 2014 Mitchell Hashimoto
 core,github.com/mitchellh/go-homedir,MIT,Copyright (c) 2013 Mitchell Hashimoto
 core,github.com/mitchellh/hashstructure/v2,MIT,Copyright (c) 2016 Mitchell Hashimoto
@@ -1841,6 +1842,7 @@ core,golang.org/x/net/internal/socket,BSD-3-Clause,Copyright (c) 2009 The Go Aut
 core,golang.org/x/net/internal/socks,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
 core,golang.org/x/net/internal/timeseries,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
 core,golang.org/x/net/ipv4,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
+core,golang.org/x/net/ipv6,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
 core,golang.org/x/net/proxy,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
 core,golang.org/x/net/trace,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved
 core,golang.org/x/net/websocket,BSD-3-Clause,Copyright (c) 2009 The Go Authors. All rights reserved