move configurable parts of freebsd init script to sysconfig

[jbergstroem]

lets avoid modifying the init script by moving the configurable parts to its sysconfig counterpart

[rvagg]

whatever, I just find it hard to keep track of where "sysconfig" is across the various OS' and distros, /etc/sysconfig, /etc/defaults, /opt/foo/bar/what.

[jbergstroem]

Valid point. That's probably something that should live in README.md though

[jbergstroem]

Filing this as nitpick since we're not supposed to edit any files anyway.