HADOOP-10557. FsShell -cp -pa option for preserving extended ACLs. Contributed by Akira Ajisaka.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1603222 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6545. Finalizing rolling upgrade can make NN unavailable for a long duration. Contributed by Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1603239 13f79535-47bb-0310-9956-ffa450edef68