NTPd should not listen on all interfaces by default, e.g. if the directive
```
set system ntp listen-on (IPv4|IPv6)
```
is not set. We should move the NTPd option //interface ignore wildcard// to the //Non-configurable defaults// section of //ntp.py//
```
--- src/conf_mode/ntp.py 2019-09-27 10:29:35.194814255 +0200
+++ src/conf_mode/ntp.py.new 2019-09-27 10:31:03.488701365 +0200
@@ -41,6 +41,8 @@
restrict 127.0.0.1
restrict -6 ::1
+# Do not listen on any interface address by default
+interface ignore wildcard
#
# Configurable section
@@ -63,8 +65,6 @@
{% endif %}
{% if listen_address -%}
-# NTP should listen on configured addresses only
-interface ignore wildcard
{% for a in listen_address -%}
interface listen {{ a }}
{% endfor -%}
```