Configure interactive logon message

This is also covers the following CIS items
* CIS 1.7.1.5 Ensure permissions on /etc/issue are configured (Scored)

Change-Id: If8c237ff4db7e9ab7ee244278d28f632e73ecb56
Related-Prod: PROD-19166
diff --git a/tests/pillar/system_banner.sls b/tests/pillar/system_banner.sls
new file mode 100644
index 0000000..6c9ca6a
--- /dev/null
+++ b/tests/pillar/system_banner.sls
@@ -0,0 +1,10 @@
+linux:
+  system:
+    enabled: true
+    banner:
+      enabled: true
+      contents: |
+        ================= WARNING =================
+        This is tcpcloud network.
+        Unauthorized access is strictly prohibited.
+        ===========================================