Ability to ignore ALL devices?
I'm running separate instances of homebridge with the -U flag (i.e. `/opt/node/bin/homebridge -U ~/.tplinkbridge`) and have been having trouble with platforms making devices show up across ALL bridges even though only one has the platform in the config.json. So I have two questions:

1. Will discovered devices show up in all instances even if the tplinksmarthome platform is not in the config.json?

2. If the answer to #1 is yes, is there a way to use the MAC or manual device filtering to stop the plugin from trying to autodiscover anything at all?

I am running things in other instances to prevent a crash from bringing down my whole setup (e.g. WUnderground plugin sometimes crashes and it was bringing my door locks offline, now it's contained and only kills itself). But with platforms appearing across all instances, these devices would appear duplicated on every bridge.
