Add HADOOP-12764 to CHANGES.txt.
Add HADOOP-12764 to CHANGES.txt.

Change-Id: Ie32b71b7bd8892a3bb434aec12cdf2c43c61b897

zrccxyb62/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop