added the warning method. Not implemented properly yet.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@4768 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/util/FormFieldValidator.java

@@ -76,6 +76,14 @@ public abstract class FormFieldValidator {
         error(String.format(format,args));
     }
 
+    public void warning(String message) throws IOException, ServletException {
+        error(message); // for now
+    }
+
+    public void warning(String format, Object... args) throws IOException, ServletException {
+        warning(String.format(format,args));
+    }
+
     /**
      * Sends out an HTML fragment that indicates an error.
      *