Merge 0.7->trunk

util.sasl_cyrus: Return invalid-mechanism instead of undefined-condition where appropriate

util.sasl_cyrus: Clarify some log messages and levels

util.sasl_cyrus: Protect the call to cyrussasl.server_new properly.

Merge 0.7->trunk

util.sasl_cyrus: If available, use a c14n callback for interoperability with bad clients.

mod_saslauth: Add a sasl_realm option

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