New info/warning messages from Firecracker when using SDK

Hi there, I've been using Firecracker for a while, mainly via the Go SDK and noticed a bunch of new messages with the v1.5.1 release.

Is there a recommended way to disable these as they're not required and it's not entirely clear where they are coming from.

```bash
2024-02-05T18:34:55.694924617 [anonymous-instance:fc_vcpu 0] Received KVM_SYSTEM_EVENT: type: 2, event: 0
2024-02-05T18:34:55.694954408 [anonymous-instance:main] Vmm is stopping.
2024-02-05T18:34:55.695110571 [anonymous-instance:main] Vmm is stopping.
2024-02-05T18:34:55.725922300 [anonymous-instance:main] Firecracker exited successfully
```

Thanks. Hope the answer is also useful to others landing here.