mod_auth_cyrus: Adjust module import to work with repo clone - Fix #1744 The module import was made to work with the plugin installer, but was not compatible with the old method of cloning the whole repo

This module blocks configured queries that change server state.

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

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