add support for one stage detector in DeepSORT simple_test function

[ceykmc]

add support for one stage detector in DeepSORT simple_test function

[codecov]

Codecov Report

Merging #100 (42831df) into master (d1664f4) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   68.27%   68.29%   +0.02%     
==========================================
  Files          85       85              
  Lines        4217     4220       +3     
  Branches      820      820              
==========================================
+ Hits         2879     2882       +3     
- Misses       1065     1066       +1     
+ Partials      273      272       -1     

Flag	Coverage Δ
unittests	68.27% <0.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
mmtrack/models/mot/deep_sort.py	59.61% <0.00%> (-3.65%)	⬇️
mmtrack/datasets/sot_train_dataset.py	85.85% <0.00%> (+3.03%)	⬆️

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