Move HDFS-5495 to 2.3.0 in CHANGES.txt

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MAPREDUCE-1176. FixedLengthInputFormat and FixedLengthRecordReader (Mariappan Asokan and BitsOfInfo via Sandy Ryza)

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YARN-1400. yarn.cmd uses HADOOP_RESOURCEMANAGER_OPTS. Should be YARN_RESOURCEMANAGER_OPTS. Contributed by Raja Aluri.

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