Calculate how many log fds login+mail processes can use. If it's lower than the current fd limit, log a warning.
Calculate how many log fds login+mail processes can use. If it's lower than
the current fd limit, log a warning.

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branch : HEAD

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot,jkerihuel/dovecot