Accept and ignore SADB_X_EXT_REPLAY and SADB_X_EXT_COUNTER payloads for

Accept and ignore SADB_X_EXT_REPLAY and SADB_X_EXT_COUNTER payloads for
incoming SADB_ADD and SADB_UPDATE message. Since we send them as part of
the SADB_GET reply we must also accept them on SADB_ADD/UPDATE as sasyncd
will forward payloads previously received in SADB_GET. Fixes a bug where
sasync can't restore SAs because pfkey returns EINVAL.

From Rafa\xc5\x82 Ramocki
ok bluhm@