linux-wandboard

l2tp: Make ipv4 protocol handler namespace aware.

The infrastructure is already pretty much entirely there
to allow this conversion.

The tunnel and session lookups have per-namespace tables,
and the ipv4 bind lookup includes the namespace in the
lookup key.

Set netns_ok in l2tp_ip_protocol.

Signed-off-by: David S. Miller <davem@davemloft.net>