blkid: fix swap tests (again)

blkid: fix swap tests (again)

Some architectures (ppc ...) need a bigger swapfile than is shipped,
in the test image so the current re-make of swap was failing.

We could either ship a bigger image or just dd a bigger file...

There is one more minor problem with the tests; older mkswap does not
support the -U uuid specification.  I'm not sure offhand what to do
about that problem, or if it really needs fixing.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>