netfilter: nfnetlink_osf: extract nfnetlink_subsystem code from xt_osf.c
Move nfnetlink osf subsystem from xt_osf.c to standalone module so we can reuse it from the new nft_ost extension. Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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