[ESP4] Merge NAT-T code in esp_output

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

This is another step on the way to distilling the tunnel mode encap
code between AH/ESP/IPCOMP.

This patch removes the needless duplciation of NAT-T code between
transport mode and tunnel mode ESP4.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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