merged the last RC branch

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@16922 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Util.java

@@ -779,6 +779,19 @@ public class Util {
         return buf.toString();
     }
 
+    /**
+     * Combines all the given collections into a single list.
+     */
+    public static <T> List<T> join(Collection<? extends T>... items) {
+        int size = 0;
+        for (Collection<? extends T> item : items)
+            size += item.size();
+        List<T> r = new ArrayList<T>(size);
+        for (Collection<? extends T> item : items)
+            r.addAll(item);
+        return r;
+    }
+
     /**
      * Creates Ant {@link FileSet} with the base dir and include pattern.
      *