extensions: ipt_DNAT: Merge v1 and v2 parsers

Use v2 parser for both and copy field values into v1 data structure if
needed.

While being at it:

* Introduce parse_ports() function similar to the one in
  libipt_REDIRECT.c.
* Use xtables_strtoui() in the above instead of atoi() for integrated
  range checking.
* Parse IP addresses using inet_pton(), writing directly into
  struct nf_nat_range2 fields.

Signed-off-by: Phil Sutter <phil@nwl.cc>

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