LPS-35674 Adding test for bug fix

Hey Julio,

Brian asked for a test for a bug fix coming from the support. The bug fix affected the PermissionImporter class, and I've created a PermissionExportImportTest class to collect the permission related export import test cases there.

Since it's not just a few lines, I wanted you to take a look on it, before it gets sent to Brian. I've tried to code it in a flexible way, so it would be easy to extend the class with other methods if needed.

Thanks,

Máté