fixed a thread leak in htmlunit

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@12361 71c3de6d-444a-0410-be80-ed276b4c234a

test/pom.xml

@@ -72,7 +72,7 @@
     <dependency>
       <groupId>org.jvnet.hudson</groupId>
       <artifactId>htmlunit</artifactId>
-      <version>2.2-hudson-4</version>
+      <version>2.2-hudson-5</version>
     </dependency>
     <dependency>
       <!-- for testing JNLP launch. -->