prevent attempt to call cat -c during virDomainSave to raw
prevent attempt to call cat -c during virDomainSave to raw

This was prevent virDomainSave from working properly by default,
which is a bad thing.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

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