Enable access log explicitly in sample

spring-boot-samples/spring-boot-sample-actuator/src/main/resources/application.properties

@@ -2,6 +2,7 @@ logging.file: /tmp/logs/app.log
 management.address: 127.0.0.1
 endpoints.shutdown.enabled: true
 server.tomcat.basedir: target/tomcat
+server.tomcat.access_log_enabled: true
 server.tomcat.access_log_pattern: %h %t "%r" %s %b
 security.require_ssl: false
 service.name: Phil