mod_sasl2_fast: Only copy SASL handler internals from util.sasl instance Prevents traceback in case the session sasl handler is missing the profile table, as may be the case with non-core sasl handlers. Thanks taba for reporting

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```