mod_sasl2: Pull user-agent info into sasl_handler for later reference It may be of interest to post-auth things. Putting it on the session was another option considered, but that seemed unnecessary overhead for something that might be rarely used. sasl_handler is cleared after successful authentication.

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summary: Extra verbose stanza logging
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Summary
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This module logs the full stanzas that are sent and received into debug
logs, for debugging purposes.