[Dovecot] Automatic fd limit changing

[Timo Sirainen]

I just realized that Dovecot should probably be doing something
different with how it handles fd limits. The way it currently works is:

1. It checks some settings and warns at startup if fd limit is lower
than what master process might need.

2. For login processes it calculates how many fds are needed and then
either increases or decreases it.

So it's automatically and silently increasing fd limit for some
processes, but not for others. Should it just automatically increase the
limits to all processes when necessary, or never increase and just warn
that the limit is too low?

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