apt_conf_d: missing it apt stuffs

apt/map.jinja

@@ -16,6 +16,7 @@
         'clean_preferences_d': false,
         'remove_apt_conf': false,
         'clean_apt_conf_d': false,
+        'apt_conf_d': {},
         'default_keyserver': 'pool.sks-keyservers.net',
         'default_url': 'http://deb.debian.org/debian/',
         'default_keyring_package': 'debian-archive-keyring',