[Bug] Tailscale HEAD (1eaad7d3d) is broken in integration tests

[kradalby]

Current Behavior

Reauthentication is broken in integration tests for Tailscale clients built from HEAD due to tailscale/tailscale@1eaad7d.

It looks like the commit make fast reconnects force them to use 443, so it should not affect users as long as they use HTTPS.

The solution is likely to document that you more or less need to run HTTPS and to make integration tests that reauth is served over 443.

[kradalby]

This is fixed, but we should probably document that people should really really use HTTPS.

[kradalby]

The error at hand will only occur if you have an headscale running on http, not answering on 443, and the client tries to reconnect/reauth within 2 minutes. If it reconnects after 2 minutes, it should be fine.