Ticket: 50755 - setting nsslapd-db-home-directory is overriding db_directory
    
        Bug: If nsslapd-db-home-directory is set  for new instances the database is
                placed below this directory, not only the db environment.
    
        Fix: Use the db dir when looking up the instance dir.
    	 Make sure the log dir is below db dir and not home dir.
    	 Make sure dse.ldif is written if upgrade to split config
    		is done in a non-normal mode, eg import
    	 Make sure the db directory is set to the list of parent
    		directories for instances
    	 If dblayer is closed only temporarily do not free directory settings
    	 Adjust log level of some error messages
    
        Reviewed by: Mark, thanks