Reset Error reason after ConcurrentContainer is stopped

Error reason is not cleared after the `ConcurrentContainer` is stopped. 
It is cleared only when the `Reason` is `Auth`. 
This could be problematic if container is again started.

Author: LokeshAlamuri

spring-kafka/src/main/java/org/springframework/kafka/listener/ConcurrentMessageListenerContainer.java

@@ -390,11 +390,11 @@ public void childStopped(MessageListenerContainer child, Reason reason) {
 		int startedContainersCount = this.startedContainers.decrementAndGet();
 		if (startedContainersCount == 0) {
 			publishConcurrentContainerStoppedEvent(this.reason);
-			if (Reason.AUTH.equals(this.reason)
-					&& getContainerProperties().isRestartAfterAuthExceptions()) {
-
-				this.reason = null;
+			boolean restartContainer = Reason.AUTH.equals(this.reason)
+					&& getContainerProperties().isRestartAfterAuthExceptions();
+			this.reason = null;
 
+			if (restartContainer) {
 				// This has to run on another thread to avoid a deadlock on lifecycleMonitor
 				AsyncTaskExecutor exec = getContainerProperties().getListenerTaskExecutor();
 				if (exec == null) {