Don't retry on 400

[dmach]

Fixes: #1514

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 31.46%. Comparing base (f2952bb) to head (a07bbe2).
Report is 1 commits behind head on master.

Files	Patch %	Lines
osc/util/models.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1515      +/-   ##
==========================================
- Coverage   31.47%   31.46%   -0.02%     
==========================================
  Files         103      103              
  Lines       19068    19065       -3     
==========================================
- Hits         6002     5999       -3     
  Misses      13066    13066              

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