New port: sysutils/vzvol: Feature-rich ZFS zvol management tool

vzvol is a zvol manager, that allows a user to create,
format, and manage zvols in the context of use for
virualization. It is meant to simplify the management of
these devices, as well as allow the creation of a shim
.VMDK file to allow the use of a zvol with VirtualBox.

WWW: https://github.com/RainbowHackerHorse/vzvol

PR: 224662
Submitted by: Samantha "Rainbow" Smith <rainbow@purlinux.org>
Reviewed by: yuri