ipv6 address support

[Benda Xu]

I have noticed that my apache and proftpd are logging with
ipv6 address, like ::ffff:166.111.111.196 or 2001:da8::53fe:1. Awffull
will not recognize them, complaining "no regular expression matched".

e.g. a line of proftpd logged xferlog file:
Sat Aug 22 09:03:43 2009 19 ::ffff:111.167.226.206 283140 /var/ftp/newftp/TLF b _ o a IEUser@ ftp 0 * i

[Steve McInerney (spm)]

Thinking aloud here:
* Should be a simple addition to the complex regex used, such that it can distinguish between ip4 and ip6.
* Unsure of performance impact by doing same; so one to test.If bad; a new regex added just for ipv6 is wise.
* Also check impact on geoip lookups.

[Benda Xu (heroxbd)]

I can see in parser.h, hostname is recognized as "([[:alnum:].]+)". For ipv6 address support just add a char ":" "([[:alnum:].]+)" -> "([[:alnum:]:.]+)".

There is no need to distinguish between ipv6 and ipv4. Besides, awffull does not distinguish between an ipv4 address and a domain name.