Quieten down kafka teardown script

Kafka teardown script can exit with failure, typically when trying to
stop the broker. This commit logs the error code if the scripts fail
rather than crash out causing build failure.

Fixes #11905

Author: robbavey

qa/integration/services/kafka_teardown.sh

@@ -8,14 +8,17 @@ KAFKA_HOME=$INSTALL_DIR/kafka
 
 stop_kafka() {
     echo "Stopping Kafka broker"
-    $KAFKA_HOME/bin/kafka-server-stop.sh
+    $KAFKA_HOME/bin/kafka-server-stop.sh || EXIT=$?
+    echo "Kafka broker stopped with exit code $EXIT"
     echo "Stopping zookeeper"
-    $KAFKA_HOME/bin/zookeeper-server-stop.sh
+    $KAFKA_HOME/bin/zookeeper-server-stop.sh || EXIT=$?
+    echo "Zookeeper stopped with exit code $EXIT"
 }
 
 # delete test topic
 echo "Deleting test topic in Kafka"
-$KAFKA_HOME/bin/kafka-topics.sh --delete --topic logstash_topic_plain --zookeeper localhost:2181 --if-exists
+$KAFKA_HOME/bin/kafka-topics.sh --delete --topic logstash_topic_plain --zookeeper localhost:2181 --if-exists || EXIT=$?
+echo "Deleted test topic in Kafka with exit code $EXIT"
 stop_kafka
 rm -rf /tmp/ls_integration/kafka-logs
 rm -rf /tmp/zookeeper