Support for choosing between standalone VMs versus linked clone VMs

[phillipross]

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Description

When building an image with the parallels-pvm builder, packer seems to create a VM with a snapshot named "vagrant_linked_clone" and the resulting artifact with a snapshot included. I'm not sure if the builder explicitly chooses to use a linked clone or if it's the default, but it would be helpful to have some kind of control over this via a builder option. Despite the advantages of linked clones, having a VM without snapshots would be more convenient in some cases.

Use Case(s)

When chaining together multiple parallels-pvm builders, having standalone VMs without snapshots rather than linked clones can be more convenient for creating transportable vagrant boxes.

Potential configuration

Maybe a new option in the builder config to provide control over snapshot/linked-clone options?