Support disabling pylint via the command line

[orf]

Hey, thank you for this package! I have a small feature request - we add --pylint to our setup.cfg file so that it is always run alongside our tests:

[tool:pytest]
addopts = -p no:cacheprovider -n auto --junitxml /tmp/unit_results.xml --pylint

This works fine, but I find myself wishing to just run our tests locally without the linting (which is a bit faster).

I'd love the ability to run pytest --no-pylint and have it override the auto-included --pylint flag, so that pytest --pylint --no-pylint will not run pylint.

[carsongee]

This is a great idea, I've often found myself wanting the same thing.

[orf]

Awesome, thank you for the fast turnaround!