ixgbe: Correct handling of any outer UDP checksum setting

ixgbe: Correct handling of any outer UDP checksum setting

BugLink: http://bugs.launchpad.net/bugs/1536473
If an outer UDP checksum is set, pass the skb up with CHECKSUM_NONE
so that the stack will check the checksum. Do not increment an
error counter, because we don't know that there is an actual error.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit d469251bfd06d15289c9dd5dd60b8ebf65785b03)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>