ntp: comment out the invalid server

When ntpd starts, it will create a daemon to connect this invalid server,
and fail, then ntpd will create other daemon to connect the local-only
(127.127.1.0) server.

The users should be aware that they need to configure the correct ntp
servers, a invalid server will lead to a redundant daemon, so it is better
to comment this example server to wait user to configure

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>