HADOOP-9343. Allow additional exceptions through the RPC layer. (sseth)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1452918 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4542. Webhdfs doesn't support secure proxy users. Contributed by Daryn Sharp.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1452978 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4540. Namenode http server should use the web authentication keytab for spnego principal. Contributed by Arpit Gupta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1453025 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4519. Support overriding jsvc binary and log file locations when launching secure datanode. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1453050 13f79535-47bb-0310-9956-ffa450edef68
YARN-227. Application expiration difficult to debug for end-users (Jason Lowe via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1453080 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5027. Shuffle does not limit number of outstanding connections (Robert Parker via jeagles)

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Merging latest trunk to branch-trunk-win

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