style: remove unused imports

Author: vlsi

src/core/src/main/java/org/apache/jmeter/gui/HtmlReportUI.java

@@ -25,9 +25,7 @@
 import java.awt.event.ActionListener;
 import java.io.File;
 import java.util.Arrays;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 import java.util.concurrent.ExecutionException;
 
 import javax.swing.ImageIcon;
@@ -40,7 +38,6 @@
 import javax.swing.SwingUtilities;
 import javax.swing.SwingWorker;
 
-import org.apache.jmeter.gui.action.ActionNames;
 import org.apache.jmeter.gui.action.HtmlReportGenerator;
 import org.apache.jmeter.gui.util.EscapeDialog;
 import org.apache.jmeter.gui.util.JMeterToolBar;

src/core/src/main/java/org/apache/jmeter/testelement/TestPlan.java

@@ -20,8 +20,6 @@
 import java.io.IOException;
 import java.io.Serializable;
 import java.net.MalformedURLException;
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 
 import org.apache.jmeter.NewDriver;