mod_http_oauth2: Allow only l10n variants of name in client metadata Since "client_name" seems to be the only human readable non-URI property that makes sense to have localized version of. Therefore it seems excessive to allow arbitrary additionalProperties. We don't make use of localized versions of client_name and URIs yet, but it would be nice to do so.

This module lets you block connections to any remote servers not on a
whitelist.

``` {.lua}
modules_enabled = {
    -- other modules --
    "s2s_whitelist",

}
s2s_whitelist = {
    "example.org",
}
```