Ticket 49387 - pbkdf2 settings were too aggressive
    
    Bug Description:  Our initial settings were too aggresive and caused some
    cpu latency issues. We should tone these down a bit, and then step
    them up slower.
    
    Fix Description:  Decrease the test rounds at start up, lower the minimum
    to 2048, and decrease the time factor to 4 ms rather than 40.
    
    Cleanup to int types.
    
    https://pagure.io/389-ds-base/issue/49387
    
    Author: wibrown
    
    Review by: mreynolds (Thanks mate!)