nuts: try to avoid address in use for most tests

[gdamore]

We get test failures somewhat frequently due to port conflicts. This attempts to make more of the tests use the trick of binding to port 0, and letting us use the random port instead.

fixes #

Note that the above format should be used in your git commit comments.
You agree that by submitting a PR, you have read and agreed to our
contributing guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.83%. Comparing base (32c78f7) to head (45ad63d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1975      +/-   ##
==========================================
- Coverage   81.84%   81.83%   -0.02%     
==========================================
  Files          95       95              
  Lines       24068    24068              
  Branches     3206     3206              
==========================================
- Hits        19699    19696       -3     
- Misses       4298     4300       +2     
- Partials       71       72       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.