Check if metadata check for labels is broken for hosts

[Munsio]

As mentioned in: CausticLab/rgon-proxy#32

The rgon.ssl label on the host machine doesn't trigger an acmetool want like described in the config file.
It could be that rancher-gen doesn't recognize the label on the host.
Maybe it is cause we set an "boolean" value.

[Munsio]

Found it:
https://github.com/CausticLab/go-rancher-gen/blob/master/runner.go#L269

We only check containers for there labels not hosts

[emcniece]

Oops... yep, that's my fault for not implementing. I really should have made a TODO note :(

[Munsio]

I will look deeper into this but i have this feeling that this would be a larger rewrite ^^