Ticket 48026 - Fix memory leak in uniqueness plugin
    
    Bug Description:  The config free function did not free all of the
                      config properly
    
    Fix Description:  Need to free the "attrs" pointer and the "attr_friendly"
                      char string.
    
    https://fedorahosted.org/389/ticket/48026
    
    Reviewed by: rmeggins(Thanks!)