mod_sasl2_fast: Fixes to make channel binding work again tls-endpoint isn't a thing that exists. Also, we needed to copy more channel binding state from the primary sasl_handler. Ideally we'd have a cleaner way to do this, but I think that's part of more substantial changes that the SASL API deserves.

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labels:
- Stage-Alpha
summary: "Bind 2 integration with SASL2"
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Add support for inlining Bind 2.0 into the SASL2 process. Experimental WIP.