Please review: Issue 49156 - Clean up test suites dir structure and docstrings

[Simon Pichugin]

Hi team,
please, review my test suites clean up.

Also, Amita, please, review the Polarion test plans part, if the fields fit the
importer.

https://pagure.io/389-ds-base/issue/49156
https://pagure.io/389-ds-base/issue/raw/files/0a0f06b64b6657be75436832cdd41e...

Thanks!
Simon