ntp: adjust initscript

Use proper status messages, make spacing standard instead of a mix of
spacing/tabbing, drop boringly obvious comment from the header.
Also make reload = restart since ntpd doesn't handle reloading resulting
in the old reload being 'stop'.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>