Halt all machines on shutdown

[mbrodala]

It would be neat if the Vagrant Manager could automatically halt all machines if the user performs a shutdown. People tend to forget and it's always good to properly halt machines.

I'm not sure if this is possible at all since the Vagrant Manager would need to block the shutdown until all machines where halted.

[kpheasey]

I'd love to see this feature too. Especially with the notorious windows update restarts. It would be great to know that I won't end up with a corrupted vm because of a windows update.

[glen-84]

Suspend is better/faster. I guess it could be an option.