Fix device.get_status() function, use `last_vpn_event` field instead of `last_seen_time` since it no longer exists.
Fix device.get_status() function, use `last_vpn_event` field instead of `last_seen_time` since it no longer exists.

Change-Type: patch

resin-io/resin-sdk-python,resin-io/resin-sdk-python