cmd/derper: add /bootstrap-dns handler

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For option (d) of #1405.

For an HTTPS request of /bootstrap-dns, this returns e.g.:

{
  "log.tailscale.io": [
    "2600:1f14:436:d603:342:4c0d:2df9:191b",
    "34.210.105.16"
  ],
  "login.tailscale.com": [
    "2a05:d014:386:203:f8b4:1d5a:f163:e187",
    "3.121.18.47"
  ]
}

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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