https://fedorahosted.org/389/ticket/47804
https://fedorahosted.org/389/attachment/ticket/47804/0001-Ticket-47804-db...
Bug description: Backup utility db2bak[.pl] copies not just backend
db files but also changelog db files, which is not associated with
the backend instance, but the backup code blindly expected it.
Fix description: If the copying directory is a changelog db dir,
skip retrieving the backend instance info and just copy the files
underneath.