Fix Python Isolation Forest Test after H2O Changes
Description
Broken test:
```
[2020-12-19T19:21:23.165Z] def testExplicitValidationFrameOnIsolationForest(spark, prostateDataset):
[2020-12-19T19:21:23.165Z] validationDatasetPath = "file://" + os.path.abspath("../examples/smalldata/prostate/prostate_anomaly_validation.csv")
[2020-12-19T19:21:23.165Z] validatationDataset = spark.read.csv(validationDatasetPath, header=True, inferSchema=True)
[2020-12-19T19:21:23.165Z]
[2020-12-19T19:21:23.165Z] algo = H2OIsolationForest(seed=1, validationDataFrame=validatationDataset, validationLabelCol="isAnomaly")
[2020-12-19T19:21:23.165Z] model = algo.fit(prostateDataset)
[2020-12-19T19:21:23.165Z] metrics = model.getValidationMetrics()
[2020-12-19T19:21:23.165Z]
[2020-12-19T19:21:23.165Z] > assert(metrics['AUC'] > 0.9)
[2020-12-19T19:21:23.165Z] E assert 0.8605769230769231 > 0.9
```
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