fix: fixed the kafka_brokers_sasl output (#341)

Co-authored-by: Conall Ó Cofaigh <[email protected]>

Author: JunliWang

outputs.tf

@@ -19,7 +19,10 @@ output "guid" {
 
 output "kafka_brokers_sasl" {
   description = "(Array of Strings) Kafka brokers use for interacting with Kafka native API"
-  value       = lookup(ibm_resource_instance.es_instance.extensions, "kafka_brokers_sasl", null)
+  value = [
+    for i in range(tonumber(ibm_resource_instance.es_instance.extensions["kafka_brokers_sasl.#"])) :
+    ibm_resource_instance.es_instance.extensions["kafka_brokers_sasl.${i}"]
+  ]
 }
 
 output "kafka_http_url" {