Fix hadoop-yarn-project/CHANGES.txt for YARN-759

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HDFS-4875. Merging change r1493854 from branch-2.

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YARN-822. Renamed ApplicationToken to be AMRMToken, and similarly the corresponding TokenSelector and SecretManager. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1493889 ../../trunk/


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YARN-610. ClientToken is no longer set in the environment of the Containers. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1493968 ../../trunk/


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HDFS-4910. Merging change r1493932 from branch-2 to branch-2.1-beta.

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YARN-839. Merging change r1493943 from branch-2 to branch-2.1-beta.

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