Fix log_collector in StackLight models

Change-Id: I7be3a7d42e34682e875e337ea16829af66802acb
diff --git a/classes/cluster/sl_k8s_contrail/stacklight/init.yml b/classes/cluster/sl_k8s_contrail/stacklight/init.yml
index 48ad663..f57c228 100644
--- a/classes/cluster/sl_k8s_contrail/stacklight/init.yml
+++ b/classes/cluster/sl_k8s_contrail/stacklight/init.yml
@@ -1,5 +1,8 @@
 classes:
+- service.grafana.collector
 - system.linux.system.repo.mcp.extra
+- system.heka.log_collector.single
+- system.heka.log_collector.output.telegraf
 - system.prometheus.collector
 - system.telegraf.agent
 parameters:
@@ -53,4 +56,4 @@
           - ${_param:stacklight_node03_hostname}.${_param:cluster_domain}
     system:
       name: ${_param:infra_config_hostname}
-      domain: ${_param:cluster_domain}
\ No newline at end of file
+      domain: ${_param:cluster_domain}