I think we should have `flapjack-nagios-receiver` default to a config file under `/etc/flapjack/` like most (all?) of the other binscripts do, that require a config file. Then we can remove the --config line in the init script. This is not critical, just would make things more consistent. 

It should be fine to point them all at the same config. I can see arguments for having one config file per init script, but I think that is largely unnecessary and overly complicated.