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
# Prosody IM Server
## Description
Prosody is a server for Jabber/XMPP written in Lua. It aims to be easy to use
and light on resources. For developers, it aims to give a flexible system on
which to rapidly develop added functionality or rapidly prototype new
protocols.
## Useful links
Homepage: https://prosody.im/
Download: https://prosody.im/download
Documentation: https://prosody.im/doc/
Issue tracker: https://issues.prosody.im/
Jabber/XMPP Chat:
Address:
prosody@conference.prosody.im
Web interface:
https://chat.prosody.im/
Mailing lists:
User support and discussion:
https://groups.google.com/group/prosody-users
Development discussion:
https://groups.google.com/group/prosody-dev
## Installation
See the accompanying INSTALL file for help on building Prosody from source.
Alternatively see our guide at https://prosody.im/doc/install