Add more logging for SSL_ERROR_SYSCALL errors in bssl_shim.cc

[andrewhop]

Issues:

Addresses V1370176317

Description of changes:

Attempt to get more information about SSL test failures. In the event of SSL_ERROR_SYSCALL errno might have more information about the issue.

Testing:

I can't reproduce the failures locally, but hopefully this prints more information that might help.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.74%. Comparing base (acf5220) to head (924db9d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2079      +/-   ##
==========================================
+ Coverage   78.73%   78.74%   +0.01%     
==========================================
  Files         598      598              
  Lines      103650   103653       +3     
  Branches    14718    14722       +4     
==========================================
+ Hits        81609    81623      +14     
+ Misses      21389    21378      -11     
  Partials      652      652              

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