Fix unit tests to properly marked deleted files
Fix unit tests to properly marked deleted files

The unit tests were playing fast and loose with the tombstone marker,
where the test framework was setting up a DiskFile object which had
its data written to the .ts file, not the .data file. This behavior
did not reflect how the interfaces to DiskFile were supposed to
work.

Change-Id: Idd6e8882e062ba2e13489f14189223ab4158677c
Signed-off-by: Peter Portante <1768998915a9d75a38099dd28e7e828cd5a8c6fe@redhat.com>

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