BugLink: http://bugs.launchpad.net/bugs/1536474

Add support to enable and disable UDP checksums via netlink. This is
similar to how VXLAN and GUE allow this. This includes support for
enabling the UDP zero checksum (for both TX and RX).
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(back ported from commit abe492b4)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>