HDFS-6810: fix compilation error in TestReplicationPolicy.java.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1615387 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10903. Merging change r1615386 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1615388 13f79535-47bb-0310-9956-ffa450edef68