[tools/shoestring]: Output node certificate as x509 v3

[ccHarvestasya]

Problem

• CA certificates are output as x509 v3, but node certificates are output as x509 v1.

Solution.

• Output node certificate as x509 v3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.24%. Comparing base (be149f3) to head (dce802a).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1422      +/-   ##
==========================================
- Coverage   98.26%   98.24%   -0.03%     
==========================================
  Files         163      158       -5     
  Lines        6691     6557     -134     
  Branches      143      143              
==========================================
- Hits         6575     6442     -133     
+ Misses        116      115       -1     

Flag	Coverage Δ
explorer-rest	?
tools-shoestring	96.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...oestring/shoestring/internal/CertificateFactory.py	100.00% <ø> (ø)

... and 5 files with indirect coverage changes

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