Preparing for 2.0.4-alpha bug-fix release.

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svn merge -c 1453955 FIXES: HDFS-4560. Webhdfs cannot use tokens obtained by another user (daryn)


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Merge remote branch 'origin/branch-2' into branch-2-gd
svn merge -c 1454019 FIXES: HADOOP-9374. Add tokens from -tokenCacheFile into UGI (daryn)


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svn merge -c 1454059 FIXES: HDFS-4566. Webdhfs token cancelation should use authentication (daryn)


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MAPREDUCE-5023. History Server Web Services missing Job Counters (Ravi Prakash via tgraves)

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Merge remote branch 'origin/branch-2' into branch-2-gd
HADOOP-9369. DNS#reverseDns() can return hostname with . appended at the end. Contributed by Karthik Kambatla.


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HDFS-4546. Merging 1r1454021 and r1454027 from trunk.

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HDFS-4569. Merge r1454233 from trunk

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YARN-443. allow OS scheduling priority of NM to be different than the containers it launches (tgraves)

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svn merge -c 1454460. Merging from trunk to branch-2 to fix HDFS-4567.

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HDFS-4571. WebHDFS should not set the service hostname on the server side. (tucu)

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svn merge -c 1454517 Merging from trunk to branch-2 to fix HDFS-4577.

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Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2' into branch-2-gd