[AusNOG] Fixes to the IPv6 survey script

[Mark Prior]

I have made some fixes to the script that generates the tables on the
IPv6 Survey page.

It can now follow HTTP redirects, as long as they stay with HTTP and
don't switch to HTTPS (or anything else for that matter :-)

This means that a number of the sites that were previously listed as
PARTIAL will now get SUCCESS (except VT.EDU who change to FAIL since
www.ipv6.vt.edu redirects to www.vt.edu and it doesn't have a AAAA
record!!).

The page <http://www.mrp.net/IPv6_Survey.html> should update in a few
hours once the script runs again.

Additions to the list to test welcome.

Mark.