mod_sasl2_fast: Restore non-FAST SASL handler upon reset This fixes an issue where, after failed FAST authentication, the FAST handler was still used (even though the client now wants to try with a password or other non-FAST credentials). A little hacky perhaps, but probably the best we can do without baking FAST support directly into mod_sasl2.

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summary: STARTTLS failure test
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This module responds to `<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>` with
`<failure xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>`, in order to test
how clients and server behave.

See [RFC6120 Section 5.4.2.2](https://xmpp.org/rfcs/rfc6120.html#rfc.section.5.4.2.2)