[incubator/kafka] Fix heapOptions template reference (#5916)

* [incubator/kafka] Fix heapOptions template reference

* Change template reference in templates/statfulset.yaml
* Ran with helm install --dry-run --debug to see that new options are
added.

* [incubator/kafka] Bump chart version

incubator/kafka/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 description: Apache Kafka is publish-subscribe messaging rethought as a distributed
   commit log.
 name: kafka
-version: 0.7.2
+version: 0.7.3
 appVersion: 4.0.1
 keywords:
 - kafka

incubator/kafka/templates/statefulset.yaml

@@ -134,7 +134,7 @@ spec:
             fieldRef:
               fieldPath: status.podIP
         - name: KAFKA_HEAP_OPTS
-          value: {{ .Values.heapOptions }}
+          value: {{ .Values.kafkaHeapOptions }}
         {{- if not (hasKey .Values.configurationOverrides "zookeeper.connect") }}
         - name: KAFKA_ZOOKEEPER_CONNECT
           value: {{ include "zookeeper.url" . | quote }}