HDFS-5338. Add a conf to disable hostname check in datanode registration.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532468 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-100046. Print a log message when SSL is enabled (David S. Wang via wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532477 13f79535-47bb-0310-9956-ffa450edef68
YARN-1295. In UnixLocalWrapperScriptBuilder, using bash -c can cause Text file busy errors. (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532532 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5330. fix readdir and readdirplus for large directories. Contributed by Brandon Li

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532539 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'origin/trunk' into yarn-261-simplified