Issue 51144 - dsctl fails with instance names that contain slapd-
    
    Bug Description:  If an instance name contains 'slapd-' the CLI breaks:
    
                          slapd-test-slapd
    
    Fix Description:  Only strip off "slapd-" from the front of the instance
                      name.
    
    relates: https://pagure.io/389-ds-base/issue/51144
    
    Reviewed by: firstyear(Thanks!)