Allocate port for tests to avoid bugs with manual allocation.

[davidv1992]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.70330% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.18%. Comparing base (359bdf8) to head (48e8bef).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
ntpd/src/daemon/keyexchange.rs	93.93%	2 Missing ⚠️
ntpd/src/daemon/spawn/sock.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1754      +/-   ##
==========================================
- Coverage   81.45%   81.18%   -0.27%     
==========================================
  Files          66       66              
  Lines       20508    20153     -355     
==========================================
- Hits        16704    16361     -343     
+ Misses       3804     3792      -12     

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