fixed horizon for sl_os_contrail

Change-Id: I8af60fa9c0f32d439cb3edb62fb9797b5d14244b
diff --git a/classes/cluster/sl_os_contrail/openstack/dashboard.yml b/classes/cluster/sl_os_contrail/openstack/dashboard.yml
index 4edfcb5..7ad6038 100755
--- a/classes/cluster/sl_os_contrail/openstack/dashboard.yml
+++ b/classes/cluster/sl_os_contrail/openstack/dashboard.yml
@@ -19,3 +19,7 @@
           proto: static
           address: ${_param:single_address}
           netmask: 255.255.255.0
+  horizon:
+    server:
+      identity:
+        host: ctl
\ No newline at end of file