add AUTHENTICATE_USER info

Author: leemdi

src/main/java/org/jax/mgi/mgd/api/util/Constants.java

@@ -4,8 +4,6 @@ public class Constants {
 
 	// HTTP status codes
 	public static Integer HTTP_OK = 200;
-//	public static Integer HTTP_BAD_REQUEST = 400;
-//	public static Integer HTTP_NOT_FOUND = 404;
 	public static Integer HTTP_SERVER_ERROR = 500;
 	public static Integer HTTP_PERMISSION_DENIED = 550;