223438a qemu: Add length for bps/iops throttling parameters to driver

Authored and Committed by John Ferlan 7 years ago
    qemu: Add length for bps/iops throttling parameters to driver
    
    Add support for a duration/length for the bps/iops and friends.
    
    Modify the API in order to add the "blkdeviotune." specific definitions
    for the iotune throttling duration/length options
    
        total_bytes_sec_max_length
        write_bytes_sec_max_length
        read_bytes_sec_max_length
        total_iops_sec_max_length
        write_iops_sec_max_length
        read_iops_sec_max_length
    
        
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