mod_posix: Remove ancient undocumented user switching

User switching has been done by prosodyctl or init scripts for a very
long time now, so this is not needed.

Using this would not have worked with module reloading (e.g. to reload
certificates) since ports are closed and re-bound, which would then not
be allowed.

Today there exists better ways to grant low ports, i.e. capabilities(7)

<Zash> Why do we have this?
<MattJ> Remove it

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