Fix the style issue introduced by cherry-pick

Author: zymap

bookkeeper-server/src/test/java/org/apache/bookkeeper/bookie/GcOverreplicatedLedgerTest.java

@@ -24,8 +24,8 @@
 import com.google.common.collect.Lists;
 
 import java.io.IOException;
-import java.net.UnknownHostException;
 import java.net.URI;
+import java.net.UnknownHostException;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;