mod_legacyauth: Removed useless 'require' call on every login attempt

core.s2smanager, xmppserver_listener: Move the responsibility of setting session.log from the latter to the former for incoming sessions (outgoing are already like this)

xmppclient_listener: Remove useless comment

core.sessionmanager, xmppclient_listener: Move responsibility for setting session.log to the former from the latter, much more sensible

net.server: Comment all calls to mem_free/collectgarbage... not really suitable for a realtime server, let's trust Lua's GC - it's good.

Shutdown prosody if changing user or group fails.

Make mod_posix not complain about root user, if setuid is set to something different as root.

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