vm-bhyve port upgrade

[Matt Churchyard]

Hello,

For anyone interested I have submitted a PR to update the version of vm-bhyve in the ports tree.
Primarily this fixes the off-putting, but completely benign error printed when users run 'vm init' (the very first thing to run...)
I've no idea if I've got the diff format right though.

Also adds various small fixes, and the following changes since the last ports version:

Command to rename a guest
Configuration options for utctime, hostbridge, disk options, debug mode, custom grub commands, virtual random device
Snapshot and rollback commands when using ZFS
Allows use of custom bridges and/or tap devices in addition to the normal automated networking
Ability to specify a custom path for disk devices
Guests can now automatically attach correctly to virtual switches if the real interface(s) (and thus the bridge) are using jumbo frames
Template options to specify zfs dataset/zvol properties to apply when creating a guest (most useful for zvol volblocksize)
New 'info' commands showing detailed guest/switch details including disk & network usage
No longer replaces dnsmasq.conf, just provides a sample config for the user to apply if they want dhcp on a nat-enabled virtual switch.

Matt (churchers)