Gutyán Gábor / circlestack

Feature Virtio

Enhance CIRCLE to use virtio-serial ports to communicate with the agent.

⚠ WARNING ⚠

Requires (virtio branch):
🆕 agentdriver
🆕 vmdriver

Tests:
* new-windows agent ✅   (Working virtio with update watchdog for service restart)
* new-linux agent ✅
* legacy-windows agent ⚠ (Old windows agent can't update)
* legacy-linux: ✅  Working update with less than 16k tar

See merge request !205