2db108c qemu: Add the length options to the iotune command line

Authored and Committed by John Ferlan 7 years ago
    qemu: Add the length options to the iotune command line
    
    Add in the block I/O throttling length/duration parameter to the command
    line if supported. If not supported, fail command creation.
    
    Add the xml2argvtest for testing.
    
        
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