[Test] Add integration test for LightGBM

[telescopic]

Description

This PR adds an integration test for the LightGBM Model artifact code

Motivation and Context

LightGBM artifact code is currently not tested.

This PR solves #1197

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature and improvements (non-breaking change which adds/improves functionality)
• Bug fix (non-breaking change which fixes an issue)
• Code Refactoring (internal change which is not user facing)
• Documentation
• Test, CI, or build

Component(s) if applicable

• BentoService (service definition, dependency management, API input/output adapters)
• Model Artifact (model serialization, multi-framework support)
• Model Server (mico-batching, dockerisation, logging, OpenAPI, instruments)
• YataiService gRPC server (model registry, cloud deployment automation)
• YataiService web server (nodejs HTTP server and web UI)
• Internal (BentoML's own configuration, logging, utility, exception handling)
• BentoML CLI

Checklist:

• My code follows the bentoml code style, both ./dev/format.sh and
  ./dev/lint.sh script have passed
  (instructions).
• My change reduces project test coverage and requires unit tests to be added
• I have added unit tests covering my code change
• My change requires a change to the documentation
• I have updated the documentation accordingly

[pep8speaks]

Hello @telescopic, Thanks for updating this PR.

There are currently no PEP 8 issues detected in this PR. Cheers! 🍻

Comment last updated at 2020-11-14 02:59:03 UTC

[codecov]

Codecov Report

Merging #1243 (fc003bc) into master (2923623) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1243      +/-   ##
==========================================
+ Coverage   66.03%   66.08%   +0.04%     
==========================================
  Files         135      141       +6     
  Lines        8553     9169     +616     
==========================================
+ Hits         5648     6059     +411     
- Misses       2905     3110     +205     

Impacted Files	Coverage Δ
bentoml/yatai/deployment/utils.py	41.66% <0.00%> (-9.19%)	⬇️
bentoml/yatai/deployment/operator.py	65.62% <0.00%> (-6.79%)	⬇️
bentoml/yatai/validator/deployment_pb_validator.py	75.67% <0.00%> (-6.15%)	⬇️
bentoml/yatai/client/bento_repository_api.py	69.01% <0.00%> (-5.99%)	⬇️
bentoml/yatai/client/deployment_api.py	32.20% <0.00%> (-4.12%)	⬇️
bentoml/cli/bento_service.py	67.15% <0.00%> (-2.55%)	⬇️
bentoml/frameworks/onnx.py	81.69% <0.00%> (-2.37%)	⬇️
bentoml/service/__init__.py	87.77% <0.00%> (-2.10%)	⬇️
bentoml/cli/utils.py	65.54% <0.00%> (-0.85%)	⬇️
bentoml/saved_bundle/config.py	88.63% <0.00%> (-0.17%)	⬇️
... and 33 more

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[telescopic]

@flosincapite , @parano , @yubozhao Please review my pull request!
Thanks in advance! :D