dntpd and rc.d

[Rumko <rumcic@xxxxxxxxx>]

since dntpd is supposed to be used instead of ntpd (as far as i know) and it
seems there is no easy way to start it at bootup like ntpd (just setting
ntpd_enable="YES"), i tried making it so that dntpd would star as easily too.
But i'm not sure if it is as simple as it seems, so i would like a comment on
http://leaf.dragonflybsd.org/~rumko/dntpd ... is this really it or did i forget
to do something else also?