Deprecate the support for "python setup.py test"

[plyfager]

Follow open-mmlab/mmcv#1637

[codecov]

Codecov Report

Merging #220 (dca1b3d) into master (6514643) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   76.71%   76.75%   +0.04%     
==========================================
  Files         130      130              
  Lines        9421     9421              
  Branches     1899     1899              
==========================================
+ Hits         7227     7231       +4     
+ Misses       1728     1726       -2     
+ Partials      466      464       -2     

Flag	Coverage Δ
unittests	76.75% <ø> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
mmgen/models/architectures/stylegan/mspie.py	91.58% <0.00%> (+0.99%)	⬆️
...chitectures/stylegan/generator_discriminator_v2.py	87.77% <0.00%> (+1.11%)	⬆️

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