Adding support for pytest with tox for single test file

[ananno]

Motivation and Context

Often when we develop one python module in blueoil, to run unit testing we've to use pytest' on entire testsdirectory. This is time consuming. A simpler and efficient way to test only onetest_file` is needed in blueoil to run unit testing for one test file.

Description

Blueoil use tox to run the unit testing with proper environment setup. For python files test the command tox -e pytest is used from inside the blueoil/lmnet directory. But often we need to run one test file which is under development without wasting time to run full pytest unit testing on entire tests directory. This modification to tox.ini file add a command pytest-only which takes a command line argument and pass it on the the tox command. By this way we can run unit testing on a single python test file using tox.

• Usage:

[blueoil/lmnet] $ tox -e pytest-only -- path/to/test_file.py

Above command will load the python test environment and configuration and run the provided python test file via command line argument.

NOTE : The -- symbol after the pytest-only command is mandatory. Which is a way to pass command line argument to tox command. Anything after -- symbol will be considered as argument.

How has this been tested?

tox -e pytest-only {path/to/single/test_file.py}

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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This PR needs Approvals as follows.

• Ownership Approval for / from iizukak, tkng, ruimashita

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[tsawada]

This PR doesn't require readability review. Please add me back if there's anything specific for review

[iizukak]

Ownership Approval

[iizukak]

/ready

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