Move HDFS-7546 to release 2.7.1 in CHANGES.txt.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -148,9 +148,6 @@ Trunk (Unreleased)
     HDFS-7591. hdfs classpath command should support same options as hadoop
     classpath (Varun Saxena via Arpit Agarwal)
 
-    HDFS-7546. Document, and set an accepting default for
-    dfs.namenode.kerberos.principal.pattern (Harsh J via aw)
-
     HDFS-316. Balancer should run for a configurable # of iterations (Xiaoyu
     Yao via aw)
 
@@ -967,6 +964,9 @@ Release 2.7.1 - UNRELEASED
 
     HDFS-8361. Choose SSD over DISK in block placement.  (szetszwo)
 
+    HDFS-7546. Document, and set an accepting default for
+    dfs.namenode.kerberos.principal.pattern (Harsh J via aw)
+
   OPTIMIZATIONS
 
   BUG FIXES