- fix/improve init script
* related to bugzilla 688132
* "rcntp ntptimeset" could not parse servers from ntp.conf when IP proto
was specified (server [-4|-6] hostname)
* "rcntp ntptimeset" is now using ip proto parameter (-4|-6) if it's set in
NTPD_OPTIONS and skip servers where the opposite proto is defined

Note: The first fix is IMO a must because parsing ntp.conf was simply wrong.
The second one is nice to have too.
Since the bug doesn't seem to affect many users it could be rolled out together
with a more important security patch.