Add logback.xml

This will ensure the logs are not too large which will improve performance
and ensure that the build works on Travis which caps the log file size.

samples/javaconfig/custom-cookie/src/main/resources/logback.xml

@@ -0,0 +1,14 @@
+<configuration>
+	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+	<encoder>
+		<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+	</encoder>
+	</appender>
+
+	<!-- <logger name="org.springframework.security" level="DEBUG"/> -->
+
+	<root level="WARN">
+	<appender-ref ref="STDOUT" />
+	</root>
+
+</configuration>