New cvsd rc.d script

[Thomas-Martin Seck]

* Doug Barton <dougb at freebsd.org> [gmane.os.freebsd.devel.ports]:

> Ying-Chieh Liao wrote:

> name="cvsd"
> -rcvar=`set_rcvar`
> -command="%%PREFIX%%/sbin/$name"
> -
> -load_rc_config $name
> +rcvar=${name}_enable
> 
> Minor issue, but saves one layer of indirection.

rc(8) still uses this style in the example scripts (at least on 6.1) --
would you mind updating it to match current rc.d policy?