datapath: Account for "udp-tunnel: Add a few more UDP tunnel APIs"

datapath: Account for "udp-tunnel: Add a few more UDP tunnel APIs"

Upstream commit:
    udp-tunnel: Add a few more UDP tunnel APIs

    Added a few more UDP tunnel APIs that can be shared by UDP based
    tunnel protocol implementation. The main ones are highlighted below.

    setup_udp_tunnel_sock() configures UDP listener socket for
    receiving UDP encapsulated packets.

    udp_tunnel_xmit_skb() and upd_tunnel6_xmit_skb() transmit skb
    using UDP encapsulation.

    udp_tunnel_sock_release() closes the UDP tunnel listener socket.

    Signed-off-by: Andy Zhou <azhou@nicira.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Upstream: 6a93cc90 ("udp-tunnel: Add a few more UDP tunnel APIs")
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>