guest_get_network_stats can silently fail in a couple of ways. Add
debug messages to these cases, so we're never completely silent on
failure.
Signed-off-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220426195526.7699-5-adeason@sinenomine.net>