Improves IPv6 addresses formatting

[denizzzka]

We have lack of support IPv6 addresses formatting, and especially, IPv4 addresses encapsulated into IPv6

This code is never called and IPv4 addresses on IPv6 interfaces logged as 0:0:0:0:0:ffff:bca2:ee5 instead of ::ffff:188.162.14.229

I made own implementation because inet_ntop from glibc internally does redundand buffer copying, uses stringz, errno and not handles rare ::2 address case