Bug#784148: base-installer: NTP daemon should be installed on any system missing an RTC

[Ben Hutchings <ben@decadent.org.uk>]

Package: base-installer
Severity: important

It is very important that Debian systems have an accurate system clock.
However not all supported systems include a battery-backed RTC (or any
working RTC).

Whenever there is not an RTC (and perhaps if there is an RTC but we
somehow recognise that it's not battery-backed), we should install and
enable a NTP daemon by default.  (Possibly we should do this by
default on everything.)

The NTP daemon should be a lightweight implementation intended for
clients, such as systemd-timesyncd, not the ntp package.  (In fact
systemd-timesyncd is installed already, it just isn't enabled.)

Ben.

-- System Information:
Debian Release: 8.0
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: armhf (armv7l)

Kernel: Linux 3.16.0-4-armmp-lpae (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)