David Anderson 05c27a7774 wgengine/router: don't touch interface routes
Developed by a cast of dozens.

Fixes #1448

Signed-off-by: David Anderson <danderson@tailscale.com>
(cherry picked from commit fa6110e47bb0f0f5320004a6a8e5ed00fa96eb44)
2021-03-12 20:48:29 -08:00
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