HADOOP-9473. Typo in FileUtil copy() method. Contributed by Glen Mazza.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1467694 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9473. Add change description missed in previous commit 1467694

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1467696 13f79535-47bb-0310-9956-ffa450edef68