Warning message before interactive login

This patch adds interactive login message to all installations
that include system/linux/system/single.

Related-Prod: PROD-19166
Related-Prod: PROD-18882

Change-Id: Ib7e9e5f1684a46cdc250214f2f640b09255d34f6
diff --git a/linux/system/single/init.yml b/linux/system/single/init.yml
index dae70ff..4429a82 100644
--- a/linux/system/single/init.yml
+++ b/linux/system/single/init.yml
@@ -1,6 +1,7 @@
 classes:
 - service.linux.system
 - service.salt.minion.master
+- system.linux.system.banner
 - system.openssh.server.single
 - system.ntp.client.single
 parameters: