DRILL-8321: Change kafka_2.13 dependency scope to test (#2662)

diff --git a/contrib/storage-kafka/pom.xml b/contrib/storage-kafka/pom.xml
index 94dc0ae..57b1f7f 100644
--- a/contrib/storage-kafka/pom.xml
+++ b/contrib/storage-kafka/pom.xml
@@ -81,6 +81,7 @@
       <groupId>org.apache.kafka</groupId>
       <artifactId>kafka_2.13</artifactId>
       <version>${kafka.version}</version>
+      <scope>test</scope>
       <exclusions>
         <exclusion>
           <groupId>org.slf4j</groupId>
diff --git a/contrib/storage-kafka/src/main/java/org/apache/drill/exec/store/kafka/MessageIterator.java b/contrib/storage-kafka/src/main/java/org/apache/drill/exec/store/kafka/MessageIterator.java
index 9827298..7282147 100644
--- a/contrib/storage-kafka/src/main/java/org/apache/drill/exec/store/kafka/MessageIterator.java
+++ b/contrib/storage-kafka/src/main/java/org/apache/drill/exec/store/kafka/MessageIterator.java
@@ -28,13 +28,13 @@
 import org.apache.kafka.clients.consumer.ConsumerRecord;
 import org.apache.kafka.clients.consumer.ConsumerRecords;
 import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.KafkaException;
 import org.apache.kafka.common.TopicPartition;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import org.apache.drill.shaded.guava.com.google.common.base.Stopwatch;
 
-import kafka.common.KafkaException;
 
 public class MessageIterator implements Iterator<ConsumerRecord<byte[], byte[]>>, AutoCloseable {