fix(p2p): status regression after entrypoint refactor

[jansegre]

Motivation

After #1086 there were some other parts that broke that weren't covered by any test.

Acceptance Criteria

• Add .entrypoints_str() helper method that returns a list of str serialized entrypoints
• Use .entrypoints_str() where previously .entrypoints was used with the expectation of being a list of str
• Add tests that cover the main 2 breakages: the status API and the PEER-ID message (when entrypoint is present)

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.86%. Comparing base (d2dde8f) to head (eecc99d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1089      +/-   ##
==========================================
+ Coverage   84.79%   84.86%   +0.07%     
==========================================
  Files         314      314              
  Lines       23900    23901       +1     
  Branches     3612     3609       -3     
==========================================
+ Hits        20265    20283      +18     
+ Misses       2917     2906      -11     
+ Partials      718      712       -6     

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