Catch IOException in TestUdpTunnel

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (aeffcde) 82.81% compared to head (ac615e9) 82.85%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #498 +/- ## ========================================== + Coverage 82.81% 82.85% +0.03% ========================================== Files 51 51 Lines 2823 2823 Branches 312 312 ========================================== + Hits 2338 2339 +1 - Misses 362 363 +1 + Partials 123 121 -2 ```

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