Add options to override used configs in inference.py

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Codecov Report

Merging #4175 (b1391bf) into master (4b03ffe) will decrease coverage by 0.19%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #4175      +/-   ##
==========================================
- Coverage   61.92%   61.72%   -0.20%     
==========================================
  Files         226      226              
  Lines       16852    16854       +2     
  Branches     2851     2852       +1     
==========================================
- Hits        10435    10403      -32     
- Misses       5895     5930      +35     
+ Partials      522      521       -1     

Flag	Coverage Δ
unittests	61.68% <33.33%> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
mmdet/apis/inference.py	19.54% <33.33%> (-0.46%)	⬇️
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.62% <0.00%> (-5.38%)	⬇️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/dense_heads/corner_head.py	74.86% <0.00%> (-1.92%)	⬇️

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