py27 unicode hostname fails allowed-hosts check

If you try and connect with a unicode hostname in python 2:
```
socket.connect((u'127.0.0.1', 51999))
```
 you get:
```
SocketConnectBlockedError: A test tried to use socket.socket.connect() with host "None" (allowed: "127.0.0.1,::1").
```
even if it's in the allowed hosts whitelist