Represents the state of an option on side of the telnet connection.
Some options can be enabled on a particular side of the connection (RFC
1073 for example: only the client can have NAWS enabled). Other options
can be enabled on either or both sides (such as RFC 1372: each side can
have its own flow control state).
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state = 'no'
'yes' or 'no' indicating whether or not
this option is enabled on one side of the connection.
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negotiating = False
A boolean tracking whether negotiation about this option is in
progress.
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onResult = None
When negotiation about this option has been initiated by this side of
the connection, a Deferred which will fire
with the result of the negotiation.
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