YARN-1528. Allow setting auth for ZK connections. (kasha)

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HDFS-5339. Merge change r1573026 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1573027 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6030.  Remove an unused constructor in INode.java (yzhang via cmccabe)

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svn merge -c 1573035 FIXES: MAPREDUCE-5768. TestMRJobs.testContainerRollingLog fails on trunk. Contributed by Gera Shegalov


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Backport HDFS-4200 from trunk: Reduce the size of synchronized sections in PacketResponder.

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HDFS-6033. PBImageXmlWriter incorrectly handles processing cache directives. Contributed by Aaron T. Myers.


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HADOOP-10285. Merging r1573052 from trunk to branch-2.

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Update target version to 2.4.0 for HADOOP-10278 and HADOOP-10285 in CHANGES.txt

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HDFS-5821. Merging r1573076 from trunk to branch-2.

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HDFS-5956. Merge change r1573078 from trunk.

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