Merge 0.12->trunk

util.startup: Support systemd Type=notify service type This lets Prosody report its lifecycle status to systemd, so it knows when Prosody has completed its startup, when it's reloading and shutting down. Both Type=notify and Type=notify-reload is supported Example systemd .service configuration snippet: [Service] Type=notify

mod_invites_adhoc: Fix result form type (thanks betarays)

MUC: Fix legacy hats (thanks nicoco) Why do we not have tests for this?

MUC: Switch to official XEP-0317 namespace for Hats (including compat) (thanks nicoco)

util.startup: Fix exiting on pidfile trouble prosody.shutdown() relies on prosody.main_thread, which has not been set yet at this point. Doing a clean shutdown might actually be harmful in case it tears down things set up by the conflicting Prosody, such as the very pidfile we were looking at. Thanks again SigmaTel71 for noticing

Merge 0.12->trunk

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.

util.startup: Abort before initialization of logging when started as root Prevents creation of log files owned by the root user which could be inaccessible once started correctly.

util.startup: Don't use not yet existent shutdown procedure when started as root (thanks SigmaTel71)