[RTNETLINK] Convert RTM_* to enum

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi:

I decided to bite the bullet and use netlink for the tunnel operations.
Before I do that, here is a patch to convert the RTM_* constants to an
enum.

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

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