split auth from other logging

[Kai Schaetzl]

I'm not going to log dovecot to mail, that creates only the same mixup as 
before, even worse, now postfix and dovecot mixed. I had to stop/start 
(force-reload would also work) rsyslogd to pick up the changed config. A 
restart doesn't change the config as with other daemons. Now I can filter 
lmtp out.

Kai

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