Ship NTP changes

Ship NTP changes

- Device time more accurate.  (e.g., +/- 10 seconds per day to < 100 ms on some devices)
   ( I know we don't need the perfect time server )
 - NTP and time will be accurate in manual mode (setting on Time Server > NTP Configuration WebGUI)
 - Change NTP "prefer" server:
    - The current preferred NTP server in an Undisciplined Local Clock.
    - This is intended when no outside source of synchronized time is available.
    - Change the "prefer" server from 127.127.1.0 to the Primary NTP server specified on
      the Time Server > NTP Configuration WebGUI page.
 - Change allows the drift file (located at /etc/ntp/drift) to be populated by ntpd.
    - The drift file is updated about once per hour which helps correct the device time.

Signed-off-by: Jon Murphy <jon.murphy@ipfire.org>