Foreman » Smart Proxy

Reported by Nick Jones.

I think the confusion comes about because the expected behaviour - having
filled out the autosuggestion range range in the Foreman UI - is that it'll
only return a suggested address from within that range. The function
within subnet.rb re-uses the existing lease if found for the autosuggestion
when it comes to provisioning, which may well be outside of this range when
you're using the auto discovery feature like we're doing.