HADOOP-9968. Makes ProxyUsers to work with NetGroups. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570934 13f79535-47bb-0310-9956-ffa450edef68
YARN-1749. Updated application-history related configs to reflect the latest reality and to be consistently named. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570948 13f79535-47bb-0310-9956-ffa450edef68
YARN-1742. Fixed javadoc of configuration parameter DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION. Contributed by Akira Ajisaka.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1570956 13f79535-47bb-0310-9956-ffa450edef68