Combine redir and masq statements into nat

All these statements are very similar, handling them with the same code
is obvious. The only thing required here is a custom extension of enum
nft_nat_types which is used in nat_stmt to distinguish between snat and
dnat already. Though since enum nft_nat_types is part of kernel uAPI,
create a local extended version containing the additional fields.

Note that nat statement printing got a bit more complicated to get the
number of spaces right for every possible combination of attributes.

Note also that there wasn't a case for STMT_MASQ in
rule_parse_postprocess(), which seems like a bug. Since STMT_MASQ became
just a variant of STMT_NAT, postprocessing will take place for it now
anyway.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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