Fix IPv6 support in obfsproxy
Adding my comment from #5083 (closed) here:
Note that strchr() does the wrong thing here, because it finds the first ':' in the string, not the last. That doesn't work for IPv6 addresses. That's a bug in resolve_address_port() in util.c, too!
I think this should be strrchr().
There may be more problems with obfsproxy and IPv6.