[PATCH] xfstests: stop special casing nfs and udf

[Christoph Hellwig]

On Fri, Dec 06, 2013 at 10:59:41AM +0400, Stanislav Kholmanskikh wrote:
> Sorry for my post-commit "review".
> 
> But for what purposes did you delete this scratch device handling for nfs?
> Now each test case that uses _require_scratch returns [not run].
> 
> It means most of the generic/ test cases.
> 
> I think we should revert this part of code. How do you think?

Tests really requiring a scratch device don't make sense for XFS,
as the scratch device is supposed to get recreated for every test.

However it seems like a lot of tests should simply run on the test
device. I'll take care of moving them over to use the test device.