prosodyctl check: Warn about invalid domain names in the config file
This ensures that domain names of virtual hosts and components are valid in
XMPP, and that they are encoded correctly.
# XEP-0012: Last Activity / mod_uptime
[Client] Romeo
jid: romeo@localhost
password: password
-----
Romeo connects
Romeo sends:
<iq id='a' type='get' to='localhost'>
<query xmlns='jabber:iq:last'/>
</iq>
Romeo receives:
<iq type='result' id='a' from='localhost'>
<query xmlns='jabber:iq:last' seconds='0'/>
</iq>
Romeo disconnects