mod_pubsub_serverinfo: Update to use mod_server_info (fixes #1841)
...but only for Prosody trunk users, because 0.12 mod_server_contact_info does
not use the new API in mod_server_info.
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",
}
```