David Crawshaw 0f73070a57 wgengine: shut down wireguard on Close
This was (presumably) missing from wgengine because the
interactions between magicsock and wireguard-go meant that the
shutdown never worked. Now those are fixed, actually shut down.

Fixes occasional flake in expanded ipn/e2e_test.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
2020-03-08 09:03:27 -04:00
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