Update common to its latest version

[humitos]

Get new configs from common.

[stsewd]

Looks like there are some py2 bits that can be removed https://github.com/rtfd/readthedocs.org/blob/50cb9a24045cf29c5719ffb92fd22cfdd54b0f34/readthedocs/config/models.py#L8

[stsewd]

We can remove the object inheritance (there are just a couple of places).

But we also have pylint: logging-format-interpolation / Use % formatting in logging functions and pass the % p which is in a lot of places and isn't a little to refactor :/, so is better to ignore the formatting check for now I guess :(

[humitos]

@stsewd I think making our code to pass the linter completely could be a "Good First Issue". Marking it as that to allow folk find it and helps us on this.

The actionable here is:

1. update our common/ submodule to the latest master
2. run tox -e lint to find out the problems
3. adapt the code to fix those problems
4. run tox -e lint and make it succeed --iterating between 2 and 3

[stsewd]

If anyone wants to send a PR for this, I'd appreciate separating it in little chunks, so it's easy to review :)

[saadmk11]

@stsewd I have found 50+ pylint: logging-format-interpolation / Use % formatting in logging functions and pass the % p issues. how do you want the PRs to be separated ? should I add different PRs for Different files?

[stsewd]

I think for each constant or module.

[saadmk11]

Created All the PRs needed to fix the lint issues. :)

[stsewd]

Linter is fixed!

Thanks @saadmk11!

[saadmk11]

Glad I could Help ! 💯