Ensure lifecycle callbacks are applied to delegate

When wrapping a ThreadPoolTaskExecutor in a bean postprocessor
we should take care that the delegate gets the lifecycle callbacks
from the container. Otherwise when it is first used, the thread pool
will not have been initialized, resulting in an exception.

(Can't believe this ever actually worked)

spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/instrument/async/LazyTraceThreadPoolTaskExecutor.java

@@ -37,6 +37,7 @@ import org.springframework.util.concurrent.ListenableFuture;
  * @author Marcin Grzejszczak
  * @since 1.0.10
  */
+@SuppressWarnings("serial")
 public class LazyTraceThreadPoolTaskExecutor extends ThreadPoolTaskExecutor {
 
 	private static final Log log = LogFactory.getLog(MethodHandles.lookup().lookupClass());
@@ -83,6 +84,17 @@ public class LazyTraceThreadPoolTaskExecutor extends ThreadPoolTaskExecutor {
 		return this.delegate.submitListenable(new SpanContinuingTraceCallable<>(tracer(), traceKeys(), spanNamer(), task));
 	}
 
+	public void destroy() {
+		this.delegate.destroy();
+		super.destroy();
+	}
+
+	@Override
+	public void afterPropertiesSet() {
+		this.delegate.afterPropertiesSet();
+		super.afterPropertiesSet();
+	}
+
 	private Tracer tracer() {
 		if (this.tracer == null) {
 			this.tracer = this.beanFactory.getBean(Tracer.class);