plugin XEP-0384: temporarily disable `<iq>` stanza encryption: `<iq>` stanza encryption is implemented, but the `send` trigger doesn't catch all `iq` stanza send (which are often sent directly with `xmlstream.send`), and some stanza encryption may cause trouble (happened with disco on a bare jid). It is temporarily disabled but should be reactivated before `0.9` release.