Expose necessary parameters from `BoosterUtils.encodeBinaryClassificationBooster()`

[terrytangyuan]

Current in BoosterUtils.encodeBinaryClassificationBooster(), some parameters we used for MiningModelUtil.createBinaryLogisticClassification() and ModelUtil.createPredictedOutput() are hard-coded. It would be better if we can look into JPMML docs further to see if some of those should be exposed to users.