Ticket 3 lib389 - python 3 support for subset of pwd cases
    
    Bug Description:  python 3 support for pwd test cases.
    
    Fix Description:  Add support for python 3 to pwd test cases. Add
    the replace_many function to improve our cases cleanliness
    over apply_mods
    
    https://pagure.io/lib389/issue/3
    
    Author: wibrown
    
    Review by: spichugi (Thanks!)