8e0fd24 tests: utils: Add PreFormat callback for CompareXML2XML helper

Authored and Committed by crobinso 8 years ago
    tests: utils: Add PreFormat callback for CompareXML2XML helper
    
    This allows individual driver tests to hook in their own code before
    the def is formatted and compared.
    
    We will eventually use this in the qemuxml2xml
    
        
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