fix(open-id): correctly wrap connection exception

[nijel]

Catch openid specific exception and wrap it into
AuthUnreachableProvider.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.95%. Comparing base (a997eab) to head (b8ebcf3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
social_core/backends/open_id.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1486      +/-   ##
==========================================
- Coverage   78.96%   78.95%   -0.02%     
==========================================
  Files         352      352              
  Lines       11461    11465       +4     
  Branches      527      527              
==========================================
+ Hits         9050     9052       +2     
- Misses       2231     2233       +2     
  Partials      180      180              

Flag	Coverage Δ
unittests	78.95% <60.00%> (-0.02%)	⬇️

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