Goal

• Aims to implement guest-ssh-add-authorized-keys, guest-ssh-remove-authorized-keys, and guest-ssh-get-authorized-keys
  for Windows. This PR is based on Microsoft's OpenSSH implementation https://github.com/PowerShell/Win32-OpenSSH. The guest agents 
  will support Kubevirt and allow guest agent propagation to be used to dynamically inject SSH keys. 
  https://kubevirt.io/user-guide/virtual_machines/accessing_virtual_machines/#dynamic-ssh-public-key-injection-via-qemu-guest-agent

Acceptance Criteria

A list of verification conditions, successful functional tests, or expected outcomes in order to declare this story/task successfully completed.

• Verify command 'guest-ssh-add-authorized-keys' can execute successfully
  • expected outcomes: can login to VM without passwd.
• Verify command 'guest-ssh-get-authorized-keys' can execute successfully
  • expected outcomes: return existed 'id_rsa.pub' that added successfully.
• Verify command 'guest-ssh-remove-authorized-keys' can execute successfully
  • expected outcomes: existed 'id_rsa.pub' can be removed, and can't login VM anymore