Implement custom trace repository

- Upgrade to boot 2.0.0.RC1
- Copy original boot's tracing features to get used
  as a base impl for statemachine.
- Fix samples, tests.
- Fixes #491

spring-statemachine-samples/monitoring/src/main/resources/application.yml

@@ -4,7 +4,7 @@ logging:
 spring:
   autoconfigure:
     exclude:
-      - org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration
+      - org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration
 endpoints:
   default:
     web:
@@ -12,4 +12,4 @@ endpoints:
 management:
   endpoints:
     web:
-      expose: metrics,trace
+      expose: "*"

spring-statemachine-samples/monitoring/src/test/java/demo/monitoring/MonitoringTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2017 the original author or authors.
+ * Copyright 2016-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -99,8 +99,8 @@ public class MonitoringTests {
 			perform(get("/state")).
 			andExpect(status().isOk());
 		mvc.
-			perform(get("/actuator/trace")).
-			andExpect(jsonPath("$.traces.*.info.transition", containsInAnyOrder("INITIAL_S1")));
+			perform(get("/actuator/statemachinetrace")).
+			andExpect(jsonPath("$.*.info.transition", containsInAnyOrder("INITIAL_S1")));
 	}
 
 	@Before