Maisem Ali 7d6407a632 wgengine/router{windows}: return the output from the firewallTweaker
on error.

While debugging a customer issue where the firewallTweaker was failing
the only message we have is `router: firewall: error adding
Tailscale-Process rule: exit status 1` which is not really helpful.
This will help diagnose firewall tweaking failures.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
(cherry picked from commit d24a8f7b5a0bac043e81d0807e3448180ba71f1a)
2021-12-14 10:36:07 -08:00
..
2021-11-02 17:50:15 -07:00
2021-08-05 15:54:00 -07:00
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