Add message-id to more log messages

[akuchling]

Yesterday I spent some time looking into a user's complaint about not receiving a mems-talk message. Figuring this out required
cross-referencing Exim's logs and the Mailman logs, made slightly more annoying because Mailman's post log doesn't mention message-ids.

The attached patch includes the message-id in a few more log messages, and should reduce the need to go look at the MTA's logs to find when a message arrived.

[akuchling (akuchling)]

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#!@$ SourceForge file upload code... $%^$ ...

[akuchling (akuchling)]

The file logs.patch was added: Log message-id in a few spots

[twouters (twouters)]

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Thanks, applied. I have some pending patches myself that add
more logging, for what it's worth, of all kinds. However, I
did remove the i18nization of 'n/a', since syslog() messages
aren't internationalized anyway.