Test sock_connect() with IPv6 address

```
Oh, I broke sock_connect() with IPv6 address recently (when I address a check 
to ensure that the addres is resolved) and it was not noticed by the test 
suite. We need more tests.

Related fix:
http://code.google.com/p/tulip/source/detail?r=e2d5acdcd8a0831a90e792bb752ac104f
8639697
```

Original issue reported on code.google.com by `victor.s...@gmail.com` on 20 Feb 2014 at 3:55
