HADOOP-9192. Merge 1432158 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1432163 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4387. test_libhdfs_threaded SEGV on OpenJDK 7. Contributed by Colin Patrick McCabe


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1432223 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4328. TestLargeBlock#testLargeBlockSize is timing out. Contributed by Chris Nauroth


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1432226 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1432230 FIXES: MAPREDUCE-4921. JobClient should acquire HS token with RM principal (daryn via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1432232 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1429872 to add svn:ignore properties to hadoop-mapreduce-client-hs-plugins


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1432240 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'branch-2' of github.com:griddynamics/yhadoop-common into branch-2-gd
Merge branch 'branch-2-gd' of github.com:griddynamics/yhadoop-common into fb-HADOOP-9166-branch-2-gd