move change log for HADOOP-3678 from 0.18 to 0.17.2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.18@677782 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -717,9 +717,6 @@ Release 0.18.0 - Unreleased
     retrieving the address of direct buffers from compression code by obtaining
     a lock during this call. (Arun C Murthy via cdouglas)
 
-    HADOOP-3678. Avoid spurious exceptions logged at DataNode when clients
-    read from DFS. (rangadi)
-
     HADOOP-3683. Fix dfs metrics to count file listings rather than files
     listed. (lohit vijayarenu via cdouglas)
 
@@ -772,6 +769,9 @@ Release 0.17.2 - Unreleased
 
   BUG FIXES
 
+    HADOOP-3678. Avoid spurious exceptions logged at DataNode when clients
+    read from DFS. (rangadi)
+
     HADOOP-3707. NameNode keeps a count of number of blocks scheduled
     to be written to a datanode and uses it to avoid allocating more
     blocks than a datanode can hold. (rangadi)