Fix sample

Issue gh-272

samples/boot/oauth2-integration/authorizationserver/src/main/java/sample/config/AuthorizationServerConfig.java

@@ -59,7 +59,7 @@ public class AuthorizationServerConfig {
 	public RegisteredClientRepository registeredClientRepository() {
 		RegisteredClient registeredClient = RegisteredClient.withId(UUID.randomUUID().toString())
 				.clientId("messaging-client")
-				.clientSecret("secret")
+				.clientSecret("{noop}secret")
 				.clientAuthenticationMethod(ClientAuthenticationMethod.BASIC)
 				.authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
 				.authorizationGrantType(AuthorizationGrantType.REFRESH_TOKEN)