[easy] Choose an unused port when logging in.

[DailyDreaming]

Should fix #352.

Using this blocks you as the port 8080 is hard-coded into the whitelist of accepted callback_urls. A suggested work-around (with credit to @Bento007 ): https://community.auth0.com/t/allowed-callback-urls-ending-with-a-wildcard/7626/2

Currently could include changing state in the query_params to include a redirect to a whitelisted uri.

[codecov-io]

Codecov Report

Merging #353 into master will decrease coverage by 0.11%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
- Coverage   84.73%   84.61%   -0.12%     
==========================================
  Files          37       37              
  Lines        1756     1762       +6     
==========================================
+ Hits         1488     1491       +3     
- Misses        268      271       +3

Impacted Files	Coverage Δ
hca/util/__init__.py	85.13% <42.85%> (-0.58%)	⬇️

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