prosody: Move last cleanup and shutdown code into util.startup

mod_admin_shell: Squeeze some characters out of the Certificate column The more compact these are, the better

prosodyctl: Restore 'list --outdated' Parsing --flags puts it into 'opts', so --outdated wasn't passed to luarocks, breaking that functionality

mod_admin_shell: Fix description of muc:room() (thanks Link Mauve) But then this is the internal API which is weird and unfriendly to expose externally. Lots of methods to wrap tho ... one day.

mod_turn_external: Fix type of config option (thanks mirux) There was a separate boolean option to enable TLS before, but it was merged with the port number option and it seems the typed API interface got confused.

util.dns: Remove compat for pre-0.11 lack of inet_ntop binding The inet_ntop binding was added in 8b612ec00e4a and included in 0.11.0

util.dns: Replace base16 implementation with util.hex Less code!

core.certmanager: Relax certificate filename check #1713 After a survey of ACME clients it seems *.crt and *fullchain* should work for the majority. The rest get to manually copy their files.

util.dependencies: Refer to 'apt' instead of 'apt-get' The more modern and user friendly frontend, should be in every supported version of Debian and Ubuntu by now

mod_invites_register: Load mod_register_ibr in invite only mode This ensures that registration actually works even if allow_registration is not enabled.