[Machinery] machinery kiwi-export requires unmanaged-files

[Matwey V. Kornilov]

Hello,


machinery export-kiwi says:

The scope 'unmanaged-files' is part of the system description but the 
corresponding files weren't extracted during inspection.

So, how could I avoid exporting unmanaged files to kiwi description?
I really don't need them for fresh kiwi build.