Fix Ubuntu Xenial configuration

.kitchen.yml

       '*':
         - syslog_ng.config
 
-<% if %w[wheezy jessie].include?(codename) %>
+<% if %w[wheezy jessie xenial].include?(codename) %>
   pillars:
     top.sls:
       base:

syslog_ng/os_codename_map.yml

 # -*- coding: utf-8 -*-
 # vim: ft=yaml
 
+# Debian
 wheezy:
   version: 3.3
   include:
     - scl.conf
   last_include:
     - /etc/syslog-ng/conf.d/*.conf
+
+# Ubuntu
+xenial:
+  version: 3.5
+  include:
+    - scl.conf
+    - '`scl-root`/system/tty10.conf'
+  last_include:
+    - /etc/syslog-ng/conf.d/*.conf