HADOOP-16751. Followup: move java import. (#1799)

This moves the import of a java module to the preferred place in the import ordering.

Change-Id: I1a594e3d954554a72c2b71c954eda0ae940a8f70

Author: steveloughran

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/DurationInfo.java

@@ -18,13 +18,13 @@
 
 package org.apache.hadoop.util;
 
+import java.util.function.Supplier;
+
 import org.slf4j.Logger;
 
 import org.apache.hadoop.classification.InterfaceAudience.Public;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 
-import java.util.function.Supplier;
-
 /**
  * A duration with logging of final state at info or debug
  * in the {@code close()} call.