Using AntClassLoader with Closeable so that we can predictably release jar files opened by URLClassLoader

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@19472 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginManager.java

@@ -322,9 +322,8 @@ public final class PluginManager extends AbstractModelObject {
      * Orderly terminates all the plugins.
      */
     public void stop() {
-        for (PluginWrapper p : activePlugins) {
+        for (PluginWrapper p : activePlugins)
             p.stop();
-        }
         // Work around a bug in commons-logging.
         // See http://www.szegedi.org/articles/memleak.html
         LogFactory.release(uberClassLoader);