run pylint on specific module

Since pylint takes quite some time to run on the whole project and since most developers will touch only a part of the code, the lint script should have an option to define which module is to be linted.

Imported from Jira [BEAM-2000](https://issues.apache.org/jira/browse/BEAM-2000). Original Jira may contain additional context.
Reported by: uwe.jugel.

Locate the lint script and its pylint invocation, then read how project-wide linting is currently configured. Done means the script accepts a module selection and runs pylint only for that module; verify the existing lint workflow still works.

Written by the indexing model from the issue text.