[SPARK-20239][CORE][2.1-backport] Improve HistoryServer's ACL mechanism#17755

jerryshao wants to merge 1 commit intoapache:branch-2.1apache/spark:branch-2.1from

jerryshao:SPARK-20239-2.1-backportjerryshao/apache-spark:SPARK-20239-2.1-backportCopy head branch name to clipboard