Used DISM module to activate Hyper-V

Hi Peter,

Last week I was busy with the image creation process and since yesterday I'm back with the puppet module.

This pull request is just a suggestion of how could be activated Hyper-V in the compute nodes, maybe some refactoring is needed. It makes use of the DISM module, it works fine but we should figure out how to perform the reboot needed.

Also, I'm not sure if the dependencies are specified that way in the metadata.json

What do you think? It's a good way to reuse work.