rearranging nilearn test, so they are independent from each other

[djarecka]

I had problem when testing traitlets that tests were not completely independent from each other, so decided to remove the class and rearrange, so they run now in different directories etc.

[codecov-io]

Codecov Report

Merging #2226 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2226      +/-   ##
==========================================
- Coverage   72.32%   72.31%   -0.01%     
==========================================
  Files        1180     1180              
  Lines       58885    58884       -1     
  Branches     8474     8473       -1     
==========================================
- Hits        42587    42582       -5     
- Misses      14919    14923       +4     
  Partials     1379     1379

Flag	Coverage Δ
#smoketests	72.31% <100%> (-0.01%)	⬇️
#unittests	69.88% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/tests/test_nilearn.py	97.59% <100%> (-0.03%)	⬇️
nipype/pipeline/plugins/multiproc.py	76.76% <0%> (-1.41%)	⬇️
nipype/utils/profiler.py	40.12% <0%> (-1.24%)	⬇️

---

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[codecov-io]

Codecov Report

Merging #2226 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2226      +/-   ##
==========================================
- Coverage   72.32%   72.31%   -0.01%     
==========================================
  Files        1180     1180              
  Lines       58885    58884       -1     
  Branches     8474     8473       -1     
==========================================
- Hits        42587    42582       -5     
- Misses      14919    14923       +4     
  Partials     1379     1379

Flag	Coverage Δ
#smoketests	72.31% <100%> (-0.01%)	⬇️
#unittests	69.88% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/tests/test_nilearn.py	97.59% <100%> (-0.03%)	⬇️
nipype/pipeline/plugins/multiproc.py	76.76% <0%> (-1.41%)	⬇️
nipype/utils/profiler.py	40.12% <0%> (-1.24%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 32966e7...4342afc. Read the comment docs.

[djarecka]

I can add it to my traitlets PR