mod_rest: Roundtrip disco and items when string or boolean is used E.g. {disco:true} turns to <query/> and back to {disco:true}, same with {items:true}. Similarily, {disco:"node"}, {items:"node"} turn into <query node="node"/> and back.

This module lets you block connections to remote servers at the s2s
level.

``` {.lua}
s2s_blacklist = {
    "proxy.eu.jabber.org",
}
```