Quieter Logging

[dominicraf]

Have switched to v2.0.5 which is working well, thank you. But the logging is quite noisy, I think it would be helpful to have a (standard?) quieter logging option that would not log messages like:

... not reversed: Not an SRS address.
... not rewritten: local domain
... not rewritten: Valid SRS address for

Also, can postsrsd see the postfix queue ID? If so it would be helpful to have this in log entries (in the same style as postfix).