INT-4486: Properly implement stop(Runnable)

JIRA: https://jira.spring.io/browse/INT-4486

The `SmartLifecycle.stop(Runnable callback)` must always call the
`callback` in the end independently of the internal state

* Revise all the `SmartLifecycle` implementations for the proper
`callback` handling

**Cherry-pick to 5.0.x and 4.3.x**

spring-integration-syslog/src/main/java/org/springframework/integration/syslog/config/SyslogReceivingChannelAdapterFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -32,7 +32,10 @@ import org.springframework.util.Assert;
 
 /**
  * Factory bean to create syslog inbound adapters (UDP or TCP).
+ *
  * @author Gary Russell
+ * @author Artem Bilan
+ *
  * @since 3.0
  *
  */
@@ -163,6 +166,9 @@ public class SyslogReceivingChannelAdapterFactoryBean extends AbstractFactoryBea
 		if (this.adapter != null) {
 			this.adapter.stop(callback);
 		}
+		else {
+			callback.run();
+		}
 	}
 
 	@Override