Support per-module disables

[eddie-dunn]

I would like to disable a set of warnings for modules in a specific
folder.

Why? We have a Python project laid out like this:

    project/
    ├── .pylintrc
    ├── module1.py
    ├── module2.py
    └── tests/
        ├── test_module1.py
        └── test_module2.py

Our unit and function tests reside in the folder called tests/. When it comes to tests the pylint warnings missing-docstring, invalid-name and protected-access are not relevant. On the other hand, these warnings are very useful for the actual code in the project.

Also, we would like to avoid adding #-disable boilerplate inside every single file; preferably we would like to add the folder-specific disables in the project's pylintrc-file. E.g, something along the lines of

 folder-disabled=tests/:invalid-name,protected-access

in the pylintrc.

[kernc]

Blocked on and superseded by #618 and #175 (comment).

[AWhetter]

As @kernc mentioned, this is a duplicate of #618. It's actively being worked on so should be solved soon!