qemu-iotests: add poke_file utility function
The new poke_file function sets bytes at an offset in a file given a printf-style format string. It can be used to corrupt an image file for test coverage of error paths. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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