[9.20] chg: usr: Set logging category for notify/xfer-in related messages
requested to merge backport-2730-logging-category-for-notify-and-xfer-related-messages-9.20 into bind-9.20
Some 'notify' and 'xfer-in' related log messages were logged at the 'general' category instead of their own category. This has been fixed.
Closes #2730 (closed)
Backport of MR !9451 (merged)