correct locations of some items in CHANGES.txt from 1.2.0 to 1.1.2

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Preparing for 1.3.0 development on branch-1

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update release notes on branch-1 to match latest 1.1.2 release

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MAPREDUCE-5047. keep.failed.task.files=true causes job failure on secure clusters. (sandyr via tucu)

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HADOOP-9379. capture the ulimit info after printing the log to the console. Contributed by Arpit Gupta.

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HDFS-4597. Backport WebHDFS concat.


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HADOOP-7101. UserGroupInformation.getCurrentUser() fails when called from non-Hadoop JAAS context. Backported by Suresh Srinivas.

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