[Improvement] Alternative way to download kinetics

[irvingzhang0512]

Host by Common Visual Data Foundation. I'm downloading now.

可以用迅雷下载！！！！

[codecov]

Codecov Report

Merging #817 (39f94eb) into master (8972e53) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
+ Coverage   84.90%   84.91%   +0.01%     
==========================================
  Files         131      131              
  Lines        9394     9394              
  Branches     1605     1605              
==========================================
+ Hits         7976     7977       +1     
+ Misses       1012     1011       -1     
  Partials      406      406              

Flag	Coverage Δ
unittests	84.91% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmaction/datasets/pipelines/augmentations.py	93.11% <0.00%> (-0.14%)	⬇️
mmaction/core/evaluation/accuracy.py	93.18% <0.00%> (+0.90%)	⬆️

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