Use variables for kafka config/log dirs as they can be different,
starting from OC 4.1

Change-Id: Ib1de79627ae889794b63d778b5cc861f43972198
Related-PROD: PROD-25533
diff --git a/opencontrail/control/cluster4_0_k8s.yml b/opencontrail/control/cluster4_0_k8s.yml
index cb9ce4f..5564ccf 100644
--- a/opencontrail/control/cluster4_0_k8s.yml
+++ b/opencontrail/control/cluster4_0_k8s.yml
@@ -6,7 +6,7 @@
 parameters:
   _param:
     opencontrail_kafka_log_cleanup_mtime: '+7'
-    opencontrail_kafka_log_cleanup_dir: '/usr/share/kafka/logs/'
+    opencontrail_kafka_log_dir: '/usr/share/kafka/logs'
     opencontrail_version: 4.0
     linux_repo_contrail_component: oc40
     opencontrail_image_tag: latest
@@ -30,7 +30,7 @@
         - nf_conntrack_ipv4
       job:
         kafka_logs_cleanup:
-          command: "find ${_param:opencontrail_kafka_log_cleanup_dir} -name '*.log.*' -type f -mtime ${_param:opencontrail_kafka_log_cleanup_mtime} -exec rm {} \\;"
+          command: "find ${_param:opencontrail_kafka_log_dir} -name '*.log.*' -type f -mtime ${_param:opencontrail_kafka_log_cleanup_mtime} -exec rm {} \\;"
           identifier: kafka_logs_cleanup
           hour: 0
           minute: 0