[INET] Update ECN handling wrt RFC 3168

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

This patch brings the IP ECN handling up-to-date with repsect to
RFC 3168.  Mostly this means treating ECT(1) in the same way as
ECT(0).

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

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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