Ticket 48932 - stopping admin server stops all httpd processes
    
    Bug Description:  When stopping the admin server it does not specify which
                      process/config file to stop.  So all httpd services are
                      stopped.
    
    Fix Description:  In the systemd wrapper specify the admin's http.conf file
                      for the ExecStop command.
    
    https://fedorahosted.org/389/ticket/48932
    
    Reviewed by: nhosoi(Thanks!)