Add support for rpmlint folder in the root of inventory_dir

[Odilhao]

This PRs adds support for one folder called rpmlint inside of the inventory_dir.

With Pulp packaging going to Python 3.11, rpmlint is about to break when the Jenkins nodes start to use one ansible version that requires python 3.11 and install python3.11-libs, it will start to complain about the dist-utls deprecation in python 3.12+.

[evgeni]

What's the reason to do it like this vs setting rpmlint_rc_file in the manifest?

I would expect this to break when someone wants to set rc file in the manifest, but there is one in the folder?

[Odilhao]

Sometimes I forget that we can use the manifest as one Ansible Inventory, I need to buy one rubber duck

[evgeni]