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


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452920 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1452978 Merging from trunk to branch-2 to fix HDFS-4542.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452980 13f79535-47bb-0310-9956-ffa450edef68