[Dovecot] PATCH: make local IP address available to auth modules

[Matthew Reimer]

The attached patch makes the local IP address to which the client 
connected available to the authentication modules; i.e., the local IP 
address is available for substitution as %i for the mysql and pgsql 
modules. We needed this feature to support thousands of our legacy 
accounts which are authenticated by username/local_part (not the full 
email address) and IP address (one per domain).

Timo, would this be acceptable to commit?

One further improvement would be to make the remote IP address available 
as well, in case one wanted to implement a tcpwrapper-like functionality.

Matt
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