[Enhance]Unittest reconstruction

[xiliu8006]

Modify the directory structure of unit test

[codecov]

Codecov Report

Merging #303 (4a9222d) into master (1b39a48) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   50.22%   50.22%           
=======================================
  Files         173      173           
  Lines       11587    11587           
  Branches     1803     1803           
=======================================
  Hits         5820     5820           
  Misses       5406     5406           
  Partials      361      361           

Flag	Coverage Δ
unittests	50.22% <ø> (ø)

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[Tai-Wang]

test_indoor_eval and test_kitti_eval should be moved to test_metrics?