fix integrityerror during azure auth

[tiago-peres]

Bug: #749

There was someone else solving the exact thing in a different backend: #298

[codecov]

Codecov Report

Merging #750 (0e8ddac) into master (3fc92c0) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

❗ Current head 0e8ddac differs from pull request most recent head 388c0ae. Consider uploading reports for the commit 388c0ae to get more accurate results

@@            Coverage Diff             @@
##           master     #750      +/-   ##
==========================================
- Coverage   77.49%   77.27%   -0.22%     
==========================================
  Files         324      325       +1     
  Lines        9845     9875      +30     
  Branches     1173     1180       +7     
==========================================
+ Hits         7629     7631       +2     
- Misses       2065     2088      +23     
- Partials      151      156       +5     

Flag	Coverage Δ
unittests	77.27% <100.00%> (-0.22%)	⬇️

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

Impacted Files	Coverage Δ
social_core/backends/azuread.py	79.68% <100.00%> (ø)
social_core/backends/clef.py	91.66% <0.00%> (-8.34%)	⬇️
social_core/pipeline/user.py	82.60% <0.00%> (-2.47%)	⬇️
social_core/backends/google.py	69.04% <0.00%> (-1.69%)	⬇️
social_core/tests/backends/oauth.py	98.57% <0.00%> (-1.43%)	⬇️
social_core/backends/saml.py	80.31% <0.00%> (-1.29%)	⬇️
social_core/backends/openstackdev.py	0.00% <0.00%> (ø)
social_core/utils.py	86.41% <0.00%> (+0.14%)	⬆️

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[nijel]

This changes uid for existing installations what would be a breaking change. Why is ⁣upn not present in your claim?