Make version parametrized

syslog_ng/files/syslog-ng.conf

@@ -16,7 +16,8 @@ def rule_builder(rule):
       return rule[1:]
     return '"%s"' % rule
 %>\
-@version: 3.3
+
+@version: ${ syslog_config.get('version', '3.3') }
 
 @module tfjson