Ticket 50213 - fix list instance issue
    
    Bug Description: A format string would not always be created
    which caused instance list to fail. This may lead to instance
    removal failing (creation and api removal still functioned)
    
    Fix Description: Use a correctly initialised paths object, and
    add extra debugging around the list capability for -v
    
    https://pagure.io/389-ds-base/issue/50213
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: mreynolds (Thanks)