Require strict pytest xfailures

[berland]

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[codecov-commenter]

Codecov Report

Merging #385 (fe672f4) into master (0e30fb8) will not change coverage.
The diff coverage is n/a.

❗ Current head fe672f4 differs from pull request most recent head 9b6970f. Consider uploading reports for the commit 9b6970f to get more accurate results

@@           Coverage Diff           @@
##           master     #385   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files          24       24           
  Lines        3287     3287           
=======================================
  Hits         3228     3228           
  Misses         59       59           

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