Module improvements

[igor-pinchuk]

Hi,

I am using your module for bootstrapping several VMs for K8S cluster, while using it I added several important for me things that could be useful for others:

1. Added ability to passthrough PCI devices (in my case NVIDIA GPU to VM)
2. Added ability to connect to remote VMs via bastion, useful when you are configuring VMs on remote machine and cannot ssh to them directly.
3. Ability to provide ssh key as path to file or key as a key content (so you can generate key by terraform, provision VM with it and use it later for remote-exec).

If you think thees changes are useful I can create a PR.
Please let me know.

[MonolithProjects]

Hi @igor-pinchuk sure. Feel free to create a PR. Ideally separate PR per new feature. Thanks!