* replace heartbeat with health-check
* instead of steady stream of newlines every 5s, now awaits input
and responds with `vmstat` output
* more reliably use host/config/vm-exec.json to get libvirt domain name
for snapshot-revert, server address, serial ports, vagrant setting, etc
* use iptables/nftables to disable networking
* added guest/bin/disable-network-[iptables,nftables]
* added guest/bin/enable-network-[iptables,nftables]
* replace ugly ___OUTPUT___ texts in sh, bash, ksh, zsh languages
* documentation updates and tweaks
The vm-exec command now recognizes the following options:
-vm-serial -vm-heart -vm-cid -vm-vport -vm
The -vm option accepts a name and configures the serial,
heart, cid and vport appropriately.
The vm-exec command can be configured by /host/config/vm-exec.json.
