take three on local repo exclusion

manifests/os/debian.pp

@@ -189,7 +189,7 @@ class base::os::debian (
 
 class base::os::debian::apt (
   $apt_cache_notin_tmp        = false,
-  $apt_cache_tmp_dir          = '/var/cache/apt/tmp'
+  $apt_cache_tmp_dir          = '/var/cache/apt/tmp',
   $debian_stanford_repo_local = true,
 ){