mod_pubsub_subscription: Don't block pubsub unhandled or bare JID notifications The module was marking every successfully-parsed pubsub notification as handled, which could prevent local users from receiving pubsub notifications. Now it will only eat them if both: - The notification was sent to the host JID - The notification matched a node we consider ourselves subscribed to Notifications to local (i.e. non-host) JIDs will always be let through.

Generate a DNS UPDATE order in format suitable for `nsupdate` based on
current port configuration.

Example output:

```
$ prosodyctl mod_dnsupdate -d example.com -t xmpp.example.com example.com
zone example.com
server ns1.example.com
ttl 3600
add _xmpp-client._tcp.example.com IN SRV 1 1 5222
add _xmpp-server._tcp.example.com IN SRV 1 1 5269
```