mod_s2s_auth_posh: Use unused loop variable for something [luacheck] Saves a function call, shuts up luacheck. In no case does the input list of certificates not result in a list of fingerprints of equal length.

This module blocks configured queries that change server state.

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

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