Revert "udp: increase inner ip header ID during segmentation"

This reverts commit d6a8c36d

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Next commit makes this commit unnecessary.

Acked-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>