Ticket 47513 - Refine the check for @localrundir@
    
    Bug Description:  if @localrundir@ is not set, then the wrong value is used for tmpfiles.d
    
    Fix Description:  Improve the checking/setting of the localrundir.  set_path_attribute() is not
                      the correct subroutine to call as it can incorrectly add the prefix again
                      if @localrundir@ is not set.  Created new function to just add the prefix -
                      only if @localrundir@ is set.
    
    https://fedorahosted.org/389/ticket/47513
    
    Reviewed by: richm(Thanks!)