[XFRM] Add FLUSHSA and FLUSHPOLICY

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

This patch adds FLUSHSA and FLUSHPOLICY to xfrm_user which are
analagous to SADB_FLUSH and SADB_X_SPDFLUSH in af_key.

This is useful in KMs on startup/shutdown so that the system is
reset to a known state.

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

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