Added error page URL to openid login sample

samples/openid/src/main/webapp/WEB-INF/applicationContext-security.xml

@@ -15,8 +15,8 @@
     <http>
         <intercept-url pattern="/**" access="ROLE_USER"/>
         <intercept-url pattern="/openidlogin.jsp*" filters="none"/>        
-        <logout/>
-        <openid-login login-page="/openidlogin.jsp" />
+        <logout/>
+        <openid-login login-page="/openidlogin.jsp" authentication-failure-url="/openidlogin.jsp?login_error=true" />
     </http>
 
     <authentication-manager alias="authenticationManager"/>    
@@ -44,4 +44,4 @@
         <user name="http://spring.security.test.myopenid.com/" password="password" authorities="ROLE_SUPERVISOR,ROLE_USER" />
     </user-service>
 
-</b:beans>
+</b:beans>