HADOOP-12116. Fix unrecommended syntax usages in hadoop/hdfs/yarn script for cygwin in branch-2. Contributed by Li Lu.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -913,6 +913,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12159. Move DistCpUtils#compareFs() to org.apache.hadoop.fs.FileUtil
     and fix for HA namespaces (rchiang via rkanter)
 
+    HADOOP-12116. Fix unrecommended syntax usages in hadoop/hdfs/yarn script for
+    cygwin in branch-2. (Li Lu via cnauroth)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES