Check python scripts with pylint
- Fix a few pylint warnings.
- Add a `.pylint.rc' file with our pylint settings.
- Add pylint to `make check'.
- Install pylint in the CI.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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- Fix a few pylint warnings.
- Add a `.pylint.rc' file with our pylint settings.
- Add pylint to `make check'.
- Install pylint in the CI.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>