FR: Reaching limits should be logged (issues 2913)

[Sergey]

Hello.

Some limits can be configured in imapd.conf (such as maxlogins_per_host,
maxlogins_per_user, popminpoll). Reaching limits should be logged for 
properly diagnostic: https://github.com/cyrusimap/cyrus-imapd/issues/2913

I created this issue but encounter a problem to add patches. I put them
here.

-- 
Regards,
Sergey
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