v2.2.16 release candidate released

[Ralf Hildebrandt]

* Timo Sirainen <dovecot at dovecot.org>:

> 	+ LMTP server: Added lmtp_user_concurrency_limit setting to limit how
> 	  many LMTP deliveries can be done concurrently for a single user.

That's broken! 0 doesn't remove the limit :(

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