mod_sasl2_fast: Fix malformed-request when using HT-*-NONE (thanks lnj!) This crept into the previous commit which tried to fail early when CB was requested but unavailable - that commit did not actually check that CB *was* requested.

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summary: Store token events in the audit log
rockspec:
  dependencies:
  - mod_audit
...

This module stores events relating to auth tokens, e.g. grant creations and revokations, in the audit log provided by `mod_audit`.