src: add nat persistent and random options

Status from this message: Applied, thanks Arturo.

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#	Subject and files	Size	Replies	Applied
1/2	src: add nat persistent and random options`include/linux/netfilter/nf_conntrack_tuple_common.h` `include/linux/netfilter/nf_nat.h` `include/statement.h` +5 more	+130 -2	1 reply
2/2	src: add masquerade support`include/statement.h` `src/evaluate.c` `src/netlink_delinearize.c` +4 more	+92 -2	1 reply

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.