Add alerta username and password to models

Change-Id: I422ec5d59fe1414abfa2f2e2f25421afcc9f0626
PROD-related: PROD-21265
diff --git a/classes/cluster/sl-os-contrail/stacklight/init.yml b/classes/cluster/sl-os-contrail/stacklight/init.yml
index 18c364e..5631501 100755
--- a/classes/cluster/sl-os-contrail/stacklight/init.yml
+++ b/classes/cluster/sl-os-contrail/stacklight/init.yml
@@ -12,6 +12,8 @@
     elasticsearch_port: 9200
     stacklight_environment: ${_param:cluster_domain}
     stacklight_notification_topic: stacklight_notifications
+    alerta_admin_username: "admin@alerta.io"
+    alerta_admin_password: "alerta"
     grafana_admin_password: admin
     grafana_database_type: mysql
     grafana_database_host: ${_param:openstack_database_address}