Optionally halt instead of destroy machines

[lotyrin]

No description provided.

[wolfgangpfnuer]

+1

By using halt, it is possible to re-run a test (ssh on jenkins) without having to rebuild the machine again

[duro]

Big +1 for this. I have some cookbooks that take 30-40 min to run the first time (lots of stuff compiled from source) and if I have to wait for server to build from 0 every time, that is going to kill me. It would be great if it just halt the VM and then subsequent times it just brought them back up and did a 'vagrant provision'