cmd/tta, vnet: add host firewall, env var support, more tests

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In particular, tests showing that #3824 works. But that test doesn't
actually work yet; it only gets a DERP connection. (why?)

Updates #13038

Change-Id: Ie1fd1b6a38d4e90fae7e72a0b9a142a95f0b2e8f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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