mod_rest: Catch one (1) reply to a POST-ed stanza from an internal source This will primarily cover error replies, and only those generated by the same Prosody instance using the `origin.reply()` method.

This module blocks configured queries that change server state.

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

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