Test the IOZone test script and XML file; fixed bugs

1. As IOZone -a will run too long time in the VM (>5 hours), changed the
IOZone run parameters to run throughput test. This can be changed later,
or create new IOZone test cases later for other test purpose
2. Modify the XML file to make it copying logs back from VM
3. Fix framework bug to enable the log (it is called "uploadFiles")
copying.