* Implement missing tests for sniproxy
* Wire sniproxy to new appc package
* Add support to tsnet for routing subnet router traffic into netstack, so it can be handled
Updates: https://github.com/tailscale/corp/issues/15038
Signed-off-by: Tom DNetto <tom@tailscale.com>
This change refactors & moves the bulk of the app connector logic from
./cmd/sniproxy.
A future change will delete the delta in sniproxy and wire it to this type.
Signed-off-by: Tom DNetto <tom@tailscale.com>
Updates: https://github.com/tailscale/corp/issues/15038