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[SPARK-8936] [MLLIB] OnlineLDA document-topic Dirichlet hyperparamete…
…r optimization Adds `alpha` (document-topic Dirichlet parameter) hyperparameter optimization to `OnlineLDAOptimizer` following Huang: Maximum Likelihood Estimation of Dirichlet Distribution Parameters. Also introduces a private `setSampleWithReplacement` to `OnlineLDAOptimizer` for unit testing purposes. Author: Feynman Liang <fliang@databricks.com> Closes #7836 from feynmanliang/SPARK-8936-alpha-optimize and squashes the following commits: 4bef484 [Feynman Liang] Documentation improvements c3c6c1d [Feynman Liang] Fix docs 151e859 [Feynman Liang] Fix style fa77518 [Feynman Liang] Hyperparameter optimization
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