ntp: add config to filter and set ntp interfaces (#11066)

* ntp: add config to set which interface ntp should listen

* Fixed config to only have one variable

roles/kubernetes/preinstall/templates/ntp.conf.j2

@@ -35,6 +35,13 @@ restrict -6 default kod notrap nomodify nopeer noquery limited
 restrict {{ item }}
 {% endfor %}
 
+# Needed for filtering interfaces
+{% if ntp_filter_interface %}
+{% for item in ntp_interfaces %}
+interface {{ item }}
+{% endfor %}
+{% endif %}
+
 # Needed for adding pool entries
 restrict source notrap nomodify noquery