[issue12551] Provide data for TLS channel binding

[Jacek Konieczny]

Jacek Konieczny <jajcus at jajcus.net> added the comment:

This is patch updated according to your suggestions, including raising NotImplementedError when 'tls-unique' is not available and with the ssl.HAS_TLS_UNIQUE constant added.

It also includes an important fix to the data retrieval logic (one condition had to be reverted). 

Now the code is proven to work, by testing with another implementation (SCRAM-SHA-1-PLUS authentication in Isode M-Link 15.1a0).

A alternative patch version will follow.

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Added file: http://bugs.python.org/file22651/tls_channel_binding.patch

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<http://bugs.python.org/issue12551>
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