mod_rest: Do not allow replies to <iq type=result> from webhooks Replying to a result stanza could cause loops, just as replying to an error. No stanza.name check here but it should be fine since no other kinds of stanzas have type=result, and the boolean logic would most definitely be wrong on the first attempt.

This module blocks configured queries that change server state.

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

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