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)

util.startup: Check root after detecting platform and reading config (thanks SigmaTel71) Ensures that startup.detect_platform() runs so know whether to use the POSIX method of checking the current user or something else. Also after reading the config so we know whether the root override setting is set.

mod_posix: Move everything to util.startup This allows greater control over the order of events. Notably, the internal ordering between daemonization, initialization of libunbound and setup of signal handling is sensitive. libunbound starts a separate thread for processing DNS requests. If this thread is started before signal handling has been set up, it will not inherit the signal handlers and instead behave as it would have before signal handlers were set up, i.e. cause the whole process to immediately exit. libunbound is usually initialized on the first DNS request, usually triggered by an outgoing s2s connection attempt. If daemonization happens before signals have been set up, signals may not be processed at all.

mod_bosh: Set base_type on session This fixes a traceback with mod_saslauth. Ideally we move this to util.session at some point, though.