HDFS-6008. Namenode dead node link is giving HTTP error 500. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1571881 13f79535-47bb-0310-9956-ffa450edef68
YARN-1561. Fix a generic type warning in FairScheduler. (Chen He via junping_du)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1571924 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5908. Change AclFeature to capture list of ACL entries in an ImmutableList. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1572142 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk