testing: Disable systemd's NTP service

This produces a lot of useless traffic as no NTP servers are reachable (or
even resolvable via winnetou).

Author: tobiasbrunner

testing/scripts/build-baseimage

@@ -36,6 +36,8 @@ stretch)
 esac
 SERVICES="apache2 dbus isc-dhcp-server slapd bind9 freeradius"
 INC=$INC,${SERVICES// /,}
+# additional services to disable
+SERVICES="$SERVICES systemd-timesyncd.service"
 
 CACHEDIR=$BUILDDIR/cache
 APTCACHE=$LOOPDIR/var/cache/apt/archives