Add pylint to check the code and cleanup code to comply with it

Pylint is a tool to check the code errors or warning or style.

It is very useful to debug without an IDE.

• Pylint must be added to the requirements_dev.txt.
• Pylint must be added to the MakeFile in check and as a new target.
• Actual code has numerous errors and warnings. We must fix them to pass Pylint check.

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assigned to @vtexier

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changed title from Add pylint to chek the code to Add pylint to check the code and cleanup code to comply with it

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