Support for `zvol`s and the external DHCP

[mfoacs]

Hi,

Very interesting tool, l will start testing.

As I currently have been using vm-bhyve to set up and manage my deployments, I have custom zvols attached to my vms, assigned MAC addresses for the DHCP. Those two features are essential on my environments.

I couldn't find any reference on the documentation, are those scenarios supported or will be in the future?

Thanks and congratulations on what you have accomplished so far!