[hotfix] [kafka-tests] Rename FlinkKafkaProducerTest to *ITCase

The affected tests are actually integration tests that spawn a Kafka
broker. Renaming it to *ITCase would be more appropriate.

flink-connectors/flink-connector-kafka-0.11/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer011Test.java → flink-connectors/flink-connector-kafka-0.11/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer011ITCase.java

@@ -57,7 +57,7 @@ import static org.junit.Assert.assertFalse;
  * IT cases for the {@link FlinkKafkaProducer011}.
  */
 @SuppressWarnings("serial")
-public class FlinkKafkaProducer011Test extends KafkaTestBase {
+public class FlinkKafkaProducer011ITCase extends KafkaTestBase {
 	protected String transactionalId;
 	protected Properties extraProperties;
 

flink-connectors/flink-connector-kafka-0.11/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerTest.java → flink-connectors/flink-connector-kafka-0.11/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducerITCase.java

@@ -41,7 +41,7 @@ import static org.junit.Assert.assertEquals;
  * Tests for our own {@link FlinkKafkaProducer}.
  */
 @SuppressWarnings("serial")
-public class FlinkKafkaProducerTest extends KafkaTestBase {
+public class FlinkKafkaProducerITCase extends KafkaTestBase {
 	protected String transactionalId;
 	protected Properties extraProperties;