Group multiple_times() doesn't play well with with_side_effects()

[ivancrneto]

Bug situation using multiple_times() combined with wth_side_effects() but not
and_return. The return value from the first call to the side effect method will
become the return value for all subsequent calls to the MockMethod.

Unit test which illustrates the current bug:

    def test_multiple_times_with_side_effects(self):
        mock = mox.Mox()

        mock_obj = mock.create_mock_anything()
        mock_obj.open()
        mock_obj.method(mox.is_a(int)).multiple_times().with_side_effects(lambda x: x + 1)
        mock_obj.close()
        mock.replay_all() 

        mock_obj.open() 
        actual_one = mock_obj.method(1)
        actual_three = mock_obj.method(3)
        mock_obj.close()

        assert actual_one == 2
        assert actual_three == 4

        mock.verify_all()