Ticket 47539 - Disabling DNA plug-in throws error 53
    
    If the DNA plug-in is enabled and any modify is attempted against
    the main DNA plug-in config entry (like disabling it), the operation
    will be rejected with error 53.
    
    The plug-in config validation function attempts to skip validation
    of the main DNA plug-in config entry, but it returns DNA_FAILURE,
    which causes the operation to be rejected.  The validation function
    needs to return DNA_SUCCESS to allow changes to be made to the main
    config entry.