Moving CHANGES.txt entry for MAPREDUCE-4742 to branch-2.7.
Moving CHANGES.txt entry for MAPREDUCE-4742 to branch-2.7.

(cherry picked from commit bd0a9ba8e3b1c75dd2fc4cc65cb00c3e31d609ce)

zrccxyb62/hadoop,Microsoft-CISL/hadoop-prototype,zrccxyb62/hadoop,intel-hadoop/hadoop,zrccxyb62/hadoop,intel-hadoop/hadoop,MjAbuz/hadoop,zrccxyb62/hadoop,MjAbuz/hadoop,satishpatil2k13/ODPI-Hadoop,intel-hadoop/hadoop,satishpatil2k13/ODPI-Hadoop,MjAbuz/hadoop,zrccxyb62/hadoop,zrccxyb62/hadoop,satishpatil2k13/ODPI-Hadoop,MjAbuz/hadoop,satishpatil2k13/ODPI-Hadoop,Microsoft-CISL/hadoop-prototype,MjAbuz/hadoop,Microsoft-CISL/hadoop-prototype,intel-hadoop/hadoop,Microsoft-CISL/hadoop-prototype,MjAbuz/hadoop,intel-hadoop/hadoop,zrccxyb62/hadoop,intel-hadoop/hadoop,satishpatil2k13/ODPI-Hadoop,intel-hadoop/hadoop,Microsoft-CISL/hadoop-prototype,Microsoft-CISL/hadoop-prototype,satishpatil2k13/ODPI-Hadoop,satishpatil2k13/ODPI-Hadoop,Microsoft-CISL/hadoop-prototype,satishpatil2k13/ODPI-Hadoop,MjAbuz/hadoop,Microsoft-CISL/hadoop-prototype