Add salt_minion_ca_authority param to model

Change-Id: I139d72a8b13c0aca45209ef4ef00d24398513f6c
diff --git a/classes/cluster/sl_os_ovs/stacklight/init.yml b/classes/cluster/sl_os_ovs/stacklight/init.yml
index f3d6645..86b0dc3 100644
--- a/classes/cluster/sl_os_ovs/stacklight/init.yml
+++ b/classes/cluster/sl_os_ovs/stacklight/init.yml
@@ -12,6 +12,7 @@
     stacklight_monitor_node02_address: 172.16.10.108
     stacklight_monitor_node03_address: 172.16.10.109
     salt_minion_ca_host: cfg01.${_param:cluster_domain}
+    salt_minion_ca_authority: salt_master_ca
     # Glusterfs
     glusterfs_service_host: ${_param:stacklight_monitor_address}