[FIXED HUDSON-2925] show the status of executors on the computer page.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@14829 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Functions.java

@@ -989,6 +989,10 @@ public class Functions {
             || (href.equals(".") && url.endsWith("."));
     }
 
+    public <T> List<T> singletonList(T t) {
+        return Collections.singletonList(t);
+    }
+
     /**
      * Gets all the {@link PageDecorator}s.
      */