Add output names in ONNX and simplify the unit-test

[zhiqwang]

• Add output names in ONNX
• Simplify the unit-test in test_onnx.py

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Codecov Report

Merging #151 (a123bc5) into master (ed73a5d) will decrease coverage by 0.31%.
The diff coverage is 100.00%.

❗ Current head a123bc5 differs from pull request most recent head 2a1d997. Consider uploading reports for the commit 2a1d997 to get more accurate results

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   84.50%   84.19%   -0.32%     
==========================================
  Files          12       12              
  Lines         813      797      -16     
==========================================
- Hits          687      671      -16     
  Misses        126      126              

Flag	Coverage Δ
unittests	84.19% <100.00%> (-0.32%)	⬇️

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Impacted Files	Coverage Δ
test/test_onnx.py	85.71% <100.00%> (-2.90%)	⬇️

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