Take advantage of the new abstraction and allow network devices
to be placed in any network namespace that we have a fd to talk
about.
Acked-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NDaniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>