1. don't form a opJournalPath for an in-memory database 2. return ExistingJournalError instead of a generic OpenError to enable better    handling at higher levels
1. don't form a opJournalPath for an in-memory database
2. return ExistingJournalError instead of a generic OpenError to enable better
   handling at higher levels

sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary