[msi/tests] Create only one log file and delete it afterwards

[Paul Vriens]

Hi,

Instead of having 200 logfiles we now create one that we can delete afterwards
as we know the name. This is not to speed up the tests but merely to get rid of
the log files.

We have to pass something for the log mode otherwise we would still have
multiple files.

(It also looks like Wine is still appending to that one file which is not the
same as on Windows).

Changelog
   Create only one log file and delete it afterwards

-- 
Cheers,

Paul.

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