[Refactor] Use mmcv.utils.collect_env to avoid duplicate codes

[hellock]

No description provided.

[codecov]

Codecov Report

Merging #3779 into master will increase coverage by 0.19%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3779      +/-   ##
==========================================
+ Coverage   60.93%   61.13%   +0.19%     
==========================================
  Files         217      217              
  Lines       15374    15336      -38     
  Branches     2628     2624       -4     
==========================================
+ Hits         9368     9375       +7     
+ Misses       5537     5491      -46     
- Partials      469      470       +1     

Flag	Coverage Δ
#unittests	61.13% <66.66%> (+0.19%)	⬆️

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Impacted Files	Coverage Δ
mmdet/utils/collect_env.py	40.00% <66.66%> (+17.08%)	⬆️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/dense_heads/corner_head.py	74.31% <0.00%> (-1.92%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	97.87% <0.00%> (+5.31%)	⬆️
mmdet/models/roi_heads/mask_scoring_roi_head.py	91.07% <0.00%> (+32.14%)	⬆️

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