Ticket #47456 - delete present values should append values to deleted values
    
    https://fedorahosted.org/389/ticket/47456
    Reviewed by: lkrispenz (Thanks!)
    Branch: master
    Fix Description: When deleting all values, entry_delete_present_values_wsi was
    deleting all values in the deleted_values set and replacing them with the
    present_values set.  It should not delete the values in the deleted_values
    set, it should just add to them.  This also renames valueset_add_valueset
    to valueset_set_valueset, which is what it was doing anyway.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no