Enable gvproxy /services endpoint on the host in podman machine

[cfergeau]

podman-machine does not start gvproxy with a http api endpoint on the host, only in the guest, and does not offer all endpoints. This is different from what crc does. We need to expose the endpoints needed by both projects, and to make sure there are no security concerns.

This will make use of containers/gvisor-tap-vsock#429

[cfergeau]

This should help with #14