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dS)NaQTELNET client class.

Based on RFC 854: TELNET Protocol Specification, by J. Postel and
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>>> from telnetlib import Telnet
>>> tn = Telnet('www.python.org', 79)   # connect to finger port
>>> tn.write(b'guido\r\n')
>>> print(tn.read_all())
Login       Name               TTY         Idle    When    Where
guido    Guido van Rossum      pts/2        <Dec  2 11:10> snag.cnri.reston..

>>>

Note that read_all() won't read until eof -- it just reads some data
-- but it guarantees to read at least one byte unless EOF is hit.

It is possible to pass a Telnet object to a selector in order to wait until
more data is available.  Note that in this case, read_eager() may return b''
even if there was data on the socket, because the protocol negotiation may have
eaten the data.  This is why EOFError is needed in some cases to distinguish
between "no data" and "connection closed" (since the socket also appears ready
for reading when it is closed).

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        Read all data until EOF; may block.

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        Read all data available already queued or on the socket,
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        Read either data already queued or some data available on the
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    read_lazy()
        Read all data in the raw queue (processing it first), without
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    read_very_lazy()
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    read_sb_data()
        Reads available data between SB ... SE sequence. Don't block.

    set_option_negotiation_callback(callback)
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