Incorrect handling of lack of disk space during import of ova

[Yurii Kolesnykov]

My system had run out of space during import of ova, but vbox is finished import in same manner like it was successful, but VM disk was corrupted. I thing there is 2 task here: app must check disk space == before import ==, correctly handle situation when system runs out of disk space, e.g. show message with option to delete or keep files.

[aeichner]

Please reopen if still an issue with a supported VirtualBox release.