Several of the mmp tests were failing on an s390 guest because
direct IO cannot be done on sub-sector sizes, and they were
doing 1k IOs to files on a 4k logical/physical device.

A few tests could just be changed to 4k, but others
needed fixed up output as well.

With this I have all tests passing on s390 again.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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(attaching patch to deal with ctrl characters in patch)