util/cloudenv: add Azure support & DNS IPs
And rewrite cloud detection to try to do only zero or one metadata discovery request for all clouds, only doing a first (or second) as confidence increases. Work remains for Windows, but a start. And add Cloud to tailcfg.Hostinfo, which helped with testing using "tailcfg debug hostinfo". Updates #4983 (Linux only) Updates #4984 Change-Id: Ib03337089122ce0cb38c34f724ba4b4812bc614e Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Brad Fitzpatrick

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@ -32,7 +32,7 @@ func TestHostinfoEqual(t *testing.T) {
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"ShieldsUp", "ShareeNode",
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"GoArch",
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"RoutableIPs", "RequestTags",
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"Services", "NetInfo", "SSH_HostKeys",
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"Services", "NetInfo", "SSH_HostKeys", "Cloud",
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}
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if have := fieldsOf(reflect.TypeOf(Hostinfo{})); !reflect.DeepEqual(have, hiHandles) {
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t.Errorf("Hostinfo.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
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