Werk #6625: Fixed possible failed mkbackup because of changed mknotifyd state file

The mknotifyd used specific names for a temporary file which was not excluded by the mkbackup mechanism. When a backup was performed while the mknotifyd wrote it's state file, the backup could fail with an exception like this:

OSError: [Errno 2] No such file or directory: \'/omd/sites/int_ma_5351/var/log/mknotifyd.state.new\'

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