Fix Xpp3DomUtils imports

Author: gnodet

src/main/java/org/codehaus/plexus/util/xml/Xpp3DomUtils.java

@@ -1,9 +1,5 @@
 package org.codehaus.plexus.util.xml;
 
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.Map;
-
 /*
  * Copyright The Codehaus Foundation.
  *
@@ -22,6 +18,8 @@
 
 import org.codehaus.plexus.util.xml.pull.XmlSerializer;
 
+import java.io.IOException;
+
 /** @author Jason van Zyl */
 @Deprecated
 public class Xpp3DomUtils