HADOOP-10851. NetgroupCache does not remove group memberships. (Contributed by Benoy Antony)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617612 13f79535-47bb-0310-9956-ffa450edef68
YARN-2399. Delete old versions of files. FairScheduler: Merge AppSchedulable and FSSchedulerApp into FSAppAttempt. (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617619 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10962. Flags for posix_fadvise are not valid in some architectures (David Villegas via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1617621 13f79535-47bb-0310-9956-ffa450edef68