Service state not properly detected on FreeBSD

From the pull request:

https://github.com/cfengine/masterfiles/pull/1330#issue-258167386

Services do not detect state on FreeBSD due to wrong path to init scripts when using the default sysvservice facility. Replace /etc/rc.d/$(service) with /usr/local/etc/rc.d/$(service) or /etc/rc.d/$(service) if the first does not exist.

https://github.com/cfengine/masterfiles/pull/1330#issuecomment-471127521

@nickanderson 3rd party software installed via the ports system gets installed to /usr/local by default on FreeBSD. First checking to see if the rc script to start and stop the daemon is in /usr/local and defaulting to /etc/rc.d if it does not seems reasonable