Connection establishment needs to be able to call bind()

[GoogleCodeExporter]

The blocking sequence of commands are:

s = socket.socket()
s.bind(local_address)
s.connect(remote_address)
...

The current api create_connection() does not provide the ability to provide a 
'local' address to bind to. Bind must be called between socket.socket() and 
sock.connect(), so it is appropriate to have it inside the create_connection() 
call or document clearly that create_connection(sock=sock) is preferred for 
anything like this.

Original issue reported on code.google.com by step...@thorne.id.au on 20 Mar 2013 at 12:48