[issue9682] socket.create_connection error message for domain subpart with invalid length is very confusing

[Mike Milkin]

Mike Milkin added the comment:

There are a few of interesting parts. 
1.) I noticed that the ToASCII class is not tested.  
2.) I had some unreachable branches due to concatenation of constant variable ace_prefix.  
3) I also found it weird that we only check the max of labels[-1], but decided to perserve the original functionality.

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Added file: http://bugs.python.org/file29984/Issue9682.patch

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