tstest/natlab/vnet: start adding tests

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And refactor some of vnet.go for testability.

The only behavioral change (with a new test) is that ethernet
broadcasts no longer get sent back to the sender.

Updates #13038

Change-Id: Ic2e7e7d6d8805b7b7f2b5c52c2c5ba97101cef14
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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