sasl: fix zero-length response encoding.#22218
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A sasl zero-length normal response is an empty string, unlike an initial response. Since the encoding of a zero-length initial response is protocol dependent, move its handling to the protocol-specific sendauth procedure. Similarly, do not check for an '=' server message, as this should normally never occur. Update the erroneous tests accordingly.
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A sasl zero-length normal response is an empty string, unlike an initial response.
Since the encoding of a zero-length initial response is protocol dependent, move its handling to the protocol-specific sendauth procedure. Similarly, do not check for an '=' server message, as this should normally never occur.
Update the erroneous tests accordingly.