[issue1771364] Misc improvements for the io module

[Guido van Rossum]

Guido van Rossum added the comment:

Thanks!!

Committed revision 57564.

SocketIO was recently moved to socket.py because that's the only place
that uses it.  So I've removed it from io.__all__.

The only other change I applied was related to the isatty check -- you
accidentally changed things so that buffering would *always* be set to 1
if raw.isatty is true. The intention was for this to affect the default
only.

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resolution:  -> accepted
status: open -> closed

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