4544b45 Stop using .message attribute on exceptions

Authored and Committed by lsedlar 5 years ago
    Stop using .message attribute on exceptions
    
    It does not exist on Python 3. Converting the exception to string works
    identically.
    
    The validate methods on many phases are simplified by not calling the
    parent (which does not do anything).
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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