remove stray import

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1883394 13f79535-47bb-0310-9956-ffa450edef68

src/integrationtest/org/apache/poi/stress/HeapDump.java

@@ -22,7 +22,6 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
 import com.sun.management.HotSpotDiagnosticMXBean;
-import org.apache.poi.ss.formula.eval.NotImplementedException;
 import org.apache.poi.util.SuppressForbidden;
 
 @SuppressForbidden("class only exists for manual tests in XSSFFileHandler")
@@ -95,4 +94,4 @@ public class HeapDump {
         Method dumpHeap = hotspotMBean.getClass().getMethod("dumpHeap", String.class, boolean.class);
         dumpHeap.invoke(hotspotMBean, fileName, live);
     }
-}
+}