Examples: Don't require to create HttpSession when visiting JSP pages

examples/demo-template/admin-access-app/src/main/webapp/admin/admin.jsp

@@ -3,6 +3,7 @@
 <%@ page import="org.keycloak.representations.idm.RoleRepresentation" %>
 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
          pageEncoding="ISO-8859-1" %>
+<%@ page session="false" %>
 <html>
 <head>
     <title>Admin Interface</title>