LPS-27530 first batch of changes

Hey Julio,

As we discussed in the email thread I'm splitting up the changes into multiple PRs for the LPS-27530 ticket, so you can review it more easily and faster.

This is the first set of changes including one new class which will be a util class for all export import related path operations.

The other change is a refactoring change: we've renamed the ImportExportThreadLocal to ExportImportThreadLocal. The reason is that the import is following the export not just alphabetically but in process as well. Other similarly named classes follows the export - import order pattern as well.

Once you review this changeset (and is being comitted to the trunk), we will send the rest which belongs to this ticket, so please do not close it, or re-assign it just yet :)

Thanks,

Máté

cc: @KocsisDaniel