(self, label=None)
Stop a machine.
        @param label: machine name.
        @raise NotImplementedError: this method is abstract.
Stop a machine.
Stop a machine .
def stop(self, label=None):
        """Stop a machine.
        @param label: machine name.
        @raise NotImplementedError: this method is abstract.
        """
        raise NotImplementedError
def stop ( self , label = None ) : raise NotImplementedError