[SPARK-25362][JavaAPI] Replace Spark Optional class with Java Optional#22383

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mmolimar wants to merge 7 commits intoapache:masterfrom

mmolimar:SPARK-25395

Commits on Sep 10, 2018

Removing Optional Spark Java API
mmolimar
committed

Commits on Oct 11, 2018

Commits on Oct 13, 2018

Merge branch 'master' of https://github.com/apache/spark into SPARK-25395
mmolimar
committed

Commits on Oct 15, 2018