mod_compat_vcard: Handle vcard requests sent to full JIDs (a spec violation commited by older versions of ejabberd and possibly others) - replaces vcard_compatibility option from Prosody 0.8

module:hook("authentication-failure", function (event)
	module:log("info", "Failed authentication attempt (%s) from IP: %s", event.condition, event.session.ip);
end);