Reactive changes for samples

- Relates #750

spring-statemachine-samples/src/main/java/demo/AbstractStateMachineCommands.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 the original author or authors.
+ * Copyright 2015-2019 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.
@@ -54,13 +54,13 @@ public class AbstractStateMachineCommands<S, E> implements CommandMarker {
 
 	@CliCommand(value = "sm start", help = "Start a state machine")
 	public String start() {
-		stateMachine.start();
+		stateMachine.startReactively().subscribe();
 		return "State machine started";
 	}
 
 	@CliCommand(value = "sm stop", help = "Stop a state machine")
 	public String stop() {
-		stateMachine.stop();
+		stateMachine.stopReactively().subscribe();
 		return "State machine stopped";
 	}