Issue1210

ATM you can't open IPv6 sockets since Lib/socket.py contains the
following assert:

 518 def _realsocket(family = AF_INET, type = SOCK_STREAM, flags=0):
 519     assert family == AF_INET

on IRC pjenvey said "likely it should be but there may be other changes
needed before AF_INET6 works" and "log a ticket for that one"

Not sure if this wanted (since IPv6 may just be not supported yet as
pjenvey said) or is just a typo, anyway getaddrinfo uses a different assert:

 527 def getaddrinfo(host, port, family=AF_INET, socktype=None, proto=0,
flags=None):
 528     try:
 529         if not family in [AF_INET, AF_INET6, AF_UNSPEC]:

Also, there is a boolean has_ipv6, which is set to the constant 1. Which
says we do support ipv6. I noticed this when trying to run the test
suite for pyftpdlib (see Issue1312).

For the moment, we don't support IPV6: I have checked in a new value for
the has_ipv6 flag: False.

We will address this in the future, when a clear testing strategy for
testing IPv6 is decided. This may happen after the 2.5 release.

Fixes checked in at r7191 and r7193.