[msi/tests] Properly cleanup after each test

[Paul Vriens]

Hi,

All files in the destination directory (usually 'Program Files') are cleaned up,
but sometimes not the files/directories in the temp directory. We have to make
sure we have a clean start for every test.

I've also changed a filename from 'path' to a clearer one (me thinks).

Changelog
    Properly cleanup after each test

Cheers,

Paul.

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