Add a cert-based authentication implementation with gunicorn

[clenk]

[codecov-commenter]

Codecov Report

Merging #169 (f3bc5bf) into master (2a588aa) will decrease coverage by 2.35%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   95.09%   92.73%   -2.36%     
==========================================
  Files          24       27       +3     
  Lines        2955     3030      +75     
==========================================
  Hits         2810     2810              
- Misses        145      220      +75     

Impacted Files	Coverage Δ
medallion/scripts/cert_auth_app.py	0.00% <0.00%> (ø)
medallion/scripts/cert_auth_gunicorn.py	0.00% <0.00%> (ø)
medallion/scripts/cert_auth_worker.py	0.00% <0.00%> (ø)

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[anasmhana]

#171