XFAIL test_child_raises_parent_exits_cleanly with multiprocessing

[ogrisel]

Apparently this flaky test only fails for the non-default multiprocessing backend. While it would be nice to find a way to fix it, it seems particularly difficult to investigate.

Let's mark it as XFAIL for now while referencing the existing open issue #1086.

[codecov]

Codecov Report

Base: 94.00% // Head: 93.94% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (b394deb) compared to base (ac4ebd5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1339      +/-   ##
==========================================
- Coverage   94.00%   93.94%   -0.07%     
==========================================
  Files          52       52              
  Lines        7294     7294              
==========================================
- Hits         6857     6852       -5     
- Misses        437      442       +5     

Impacted Files	Coverage Δ
joblib/test/test_memmapping.py	99.23% <100.00%> (ø)
joblib/test/testutils.py	50.00% <0.00%> (-50.00%)	⬇️
joblib/_parallel_backends.py	93.01% <0.00%> (-1.84%)	⬇️
joblib/parallel.py	96.56% <0.00%> (+0.26%)	⬆️
joblib/test/test_store_backends.py	97.14% <0.00%> (+5.71%)	⬆️

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