test_tpot hard to maintain with tpot version update

[Qi-max]

The current tpot version is 0.9.5, newer than the current requirement of 0.9.3. If run the test_tpot with the 0.9.5 version, most of the tests will fail, because the fitted scores of the top_models would differ. The tests may need to be modified in order to avoid maintenance difficulties.