Fix examples running on LAN

[Shatur]

• We should bind "0.0.0.0" for UdpSocket.
• public_addresses is not needed with ServerAuthentication::Unsecure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.81%. Comparing base (434837b) to head (003c265).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #290   +/-   ##
=======================================
  Coverage   90.81%   90.81%           
=======================================
  Files          38       38           
  Lines        2341     2341           
=======================================
  Hits         2126     2126           
  Misses        215      215           

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