- fix swap sanity tests in blkid, and blkid tests

- fix swap sanity tests in blkid, and blkid tests

Swap is actually native-endian on disk, and with the latest
swapspace sanity checks I added we need to have native swapspace
examples in the blkid tests, so re-mkswap them during testing.

One one other required change, though; mkswap requires at least
10 pages of swap, so the image needs to be increased to 10x64k
if mkswap is to succeed...

Maybe it'd be better to just dd it out on the fly?

Addresses-redhat-bugzilla: 445786

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