IPV6 NginX support

[caronc]

Description:

Related issue (if applicable): refs #127

Update Nginx configuration so that it works with both ipv4 and ipv6

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• Tests added

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (beade2b) 94.97% compared to head (c12b436) 94.97%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #129   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files          15       15           
  Lines        1433     1433           
=======================================
  Hits         1361     1361           
  Misses         72       72           

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