Handbook/Virtualization: Various improvements to bhyve content
Tweak text on:
- supported guest OSes
- supported processors
- connecting to host network
- vmrun.sh
- booting VMs
Add new content for:
- storing UEFI variables
- using ZFS metadata-only cache
- disconnecting from VM console
- gracefully shutting down VMs
- ports for managing VMs
Reviewed by: emaste, jrm, rgrimes
Differential Revision: https://reviews.freebsd.org/D43899