xfstests: fix 108 through config mechanism

[Christoph Hellwig]

On Tue, Dec 14, 2010 at 03:53:37PM +0100, Boris Ranto wrote:
> I didn't like it much either but I found it quite easy to implement with quite high probability of future usage.
> 
> I found the following modification sufficient although I'm not sure I put the _filter_spaces in right place (I'd say it's quite universal so it could find a usage in other cases):

This patch looks good to me.  Can you resent it in the correct format:

 - a descriptive subject
 - mail body containing a short explanation, than the signed-off-by
   line, then the actual patch.