[hotfix] always obtain port in Kafka

Author: bsideup

modules/kafka/src/main/java/org/testcontainers/containers/KafkaContainer.java

@@ -83,12 +83,12 @@ protected void doStart() {
     protected void containerIsStarting(InspectContainerResponse containerInfo, boolean reused) {
         super.containerIsStarting(containerInfo, reused);
 
+        port = getMappedPort(KAFKA_PORT);
+
         if (reused) {
             return;
         }
 
-        port = getMappedPort(KAFKA_PORT);
-
         final String zookeeperConnect;
         if (externalZookeeperConnect != null) {
             zookeeperConnect = externalZookeeperConnect;