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Turns out the reason no one else runs pylint is because it's insanely
noisy here. I never noticed because I've had a global pylintrc
turning off a handful of diagnostics for who knows how long. Thanks
to courtneygo for pointing this out.

Add a local definition so other people can benefit from pylint.

This is just `pylint --generate-rcfile` with a few changes:

* Several disabled warnings because we're not in good shape yet.
* Disable report mode (only show the messages).
* Allow `^_\S*` as the unused variable name. The default is `^_$`,
  which means you can have only one unused parameter.

Change-Id: I676f1df11f7f0ebe868b6c65ee4e43c2e667caa0